Aim Ar15 Free Float Quad Rail Install

  1. Aim Ar15 Free Float Quad Rail Installation
  2. Aim Ar15 Free Float Quad Rail Installers
  3. Aim Sports Inc Ar-15 Free Float M-lok Handguard
  4. Aim Ar15 Free Float Quad Rail Install

Why install a free float handguard?

The 10' free float quad handguard rail features a one piece design and will mount over low profile gas blocks. Made of black anodized aircraft grade aluminum and compatible with most direct impingement gas systems. The T-marked rails allow accessories to be removed and replaced with ease and continuous top rail provides a monolithic look with. The AIM Sports Inc Carbine Length AR Free Float Quad Rail Mount features a one piece design and will mount over low profile gas blocks. This rail mount manufactured by the experts at AIM Sports Inc is made of black anodized aircraft grade aluminum and is compatible with most carbine length direct impingement gas systems. Complete AR15 13.5' Upper California Compliant (w/ Muzzle Break Instead of Flashhinder). Forged Upper Receiver. 13.5' Free Float M-LOK Handguard. 16'. Manufacturer DescriptionOur custom Free Float Quad Rails are available in 5 lengths, from 4' Pistol to the 16' Extended Rifle. Each comes with a ba. View full details.

One of the main benefits to free-floating an AR-15 is an increase in accuracy from reduced variability in the barrel harmonics due to sling tension. The traditional AR-15 configuration has the sling mount attachment at the base of the front sight gas block, so moderate changes in sling tension can change the point of impact downrange. A direct impingement AR-15 can never be truly “free-floated” due to the attachment of the gas block and gas tube, but the addition of a quad rail or other free float style handguard can help with accuracy and also provides a stable and convenient platform for attaching bipods, lights, grips and other accessories.

What do I need to install a free float quad rail handguard?

When planning your free-float project, take a close look at the type of gas system currently on your rifle. Most standard front sight gas blocks are held onto the barrel by either tapered pins or by clamps. Make sure you have all the right tools and parts on hand for disassembly and reassembly before starting work.

Aim Ar15 Free Float Quad Rail Installation

Step-by-Step Installation

As always, before working on any firearm make sure it’s unloaded and safe to handle.

1. First, remove the original handguards using a handguard removal tool.

2. Separate the upper and lower receivers and remove the bolt carrier group and charging handle.

3. Clamp the upper receiver into a vise using a vise block and remove the flash hider and crush washer. The crush washer will not be reused.

4. Tap out the gas tube roll pin with a #2 roll pin punch and inspect the front sight gas block. If it has tapered pins, drive them out with a cup tip punch from the small side. If unsure, measure the pin diameter on each side first. If the pins are difficult to remove, apply penetrating oil, let sit overnight and try again. Sometimes applying light heat to the area also helps with removal.

5. If the gas block is a clamp-on type, use a hex key to loosen the set screws. Remove the original front sight gas block assembly from the barrel. If it sticks, gently tap on it with a soft-faced hammer until it slides off the barrel. Remove the handguard retainer and gas tube.

6. On a bench block, align the gas tube through-hole (with the large hole facing down) into the new gas block and use a roll pin holder to start the roll pin. Drive the roll pin flush with the gas block.

7. Remove the original barrel nut/delta ring assembly with the armorer’s wrench, then clean and inspect the upper receiver threads.

8. Remove the anti-rotation screw from the bottom of the new handguards and unscrew the new barrel nut, removing it from the handguards. Apply a thin layer of high quality lithium moly grease to the inside threads of the barrel nut, install it over the barrel so that the lock ring faces toward the upper receiver, then hand-tighten the barrel nut.

9. Set your torque wrench to 30 ft/lbs and tighten the barrel nut using your armorer’s wrench. Remove the torque wrench and loosen the barrel nut with the armorer’s wrench (never loosen with a torque wrench).

10. Re-torque to 30 ft/lbs, then remove the torque wrench and loosen again. Torque to 30 ft/lbs one more time and inspect the alignment between the barrel nut hole and the gas tube hole in the upper receiver. This three-time torque sequence allows the threads on the upper receiver and barrel nut to mate more completely.

11. Without exceeding 60 ft/lbs, tighten the barrel nut until the gas tube hole in the upper receiver and the hole in the barrel nut align perfectly. The holes should line up at about 35 foot-pounds of torque, and the gas tube should be centered in the barrel nut hole without touching the edges. Do not partially loosen the barrel nut to achieve alignment – if need be, loosen the nut completely and re-tighten to align correctly.

12. Apply blue threadlocker onto the gas block set screws and slide the gas block assembly onto the barrel, making sure the gas port in the barrel aligns with the hole in the gas block. Tighten the set screws on the gas block securely.

13. Next, loosen the lock ring and carefully thread the quad rail onto the barrel nut for a couple turns. Apply blue threadlocker onto the outside barrel nut threads and screw on the quad rail.

14. Adjust the lock ring and handguard until the top rail (marked “T”) is almost aligned with the rail on the upper receiver. Use a strap wrench and carefully tighten the handguard until snug. Be careful not to over-tighten; if too much torque is applied, it can misalign the barrel nut and gas tube underneath.

15. You can check for proper gas tube installation using the bolt carrier at this time: insert the bolt carrier group (without the charging handle) into the upper receiver and slowly slide it forward, checking to make sure the carrier gas key doesn’t bind on the gas tube.

16. Take a reading with your level across the top of the upper receiver and compare it with the level of the quad rail. Adjust the quad rail rotation until it matches the level of the upper receiver.

17. Reinstall the muzzle device with a new crush washer and align it correctly (flash hiders generally with the vented ports facing upward; muzzle brakes generally with the ports facing sideways).

18. Then apply blue threadlocker onto the anti-rotation screw on the bottom of the handguard, install it, and tighten until snug.

19. Reinstall the charging handle and bolt carrier group, then reassemble the upper and lower receivers and you’re done!

At a Glance: Our Top Picks for Best AR-15 Handguards

  • OUR TOP PICK: Areo Precision AR15 ATLAS S-ONE M-LOK Handguard​
  • BEST SELLING: Geissele Super Modular MK16​

Comparison Chart of the Best AR-15 Handguards

Areo Precision AR15 ATLAS S-ONE M-LOK Handguard​​
  • Lightweight
  • M-LOK attachment slots
  • QD sling attachments
  • Strategically located Picatinny rail
Best Budget Option
Magpul MOE M-LOK Hand Guard​​
  • Affordable
  • Lightweight
  • Very comfortable
  • M-LOK mounting system
Geissele Super Modular MK16​
  • Slim cross-section
  • Tons of space for mounting accessories
  • Solid proprietary barrel nut design
  • M-LOK slots on 7 sides, full-length Picatinny rail up top

Besides the trigger group, the handguard is often a shooter’s first target for upgrading their AR 15. Choosing the best AR-15 handguards is one of the most obvious ways to improve your rifle’s functionality and aesthetics.

As with everything surrounding firearms, there is no one best option. Your choice of handguard will depend on your use case, personal taste, and budget.

That said, there are some features that are obvious choices over the competitors. M-LOK, for example, is winning the battle over KeyMod as the standard mounting system. It is even encroaching on the Picatinny rail’s turf, There are now many M-LOK compatible sighting options including open sights, lasers, red dots, and scope rings.

Our Guide to the Best AR-15 Handguards

Each of the models below come in a range of lengths to match your rifle’s barrel and gas system. We have included both free float and drop-in handguards on the list. Although free-float are arguably inherently superior, there are times and places where a great, affordable, easy-to-install drop-in model is just what the doctor ordered.

Our list covers a variety of well-respected brands and models at a wide range of price points. If you have a chance, get your hands on a few different designs before making a decision.

Areo Precision AR-15 ATLAS S-ONE M-LOK Handguard

Aero Precision operates out of Tacoma, Washington. The company got its start in manufacturing military aeronautical components but got into small arms out of the passion of the employees for shooting. Their ATLAS line of free float aluminum handguards are some of the best available on the market.

These are extremely lightweight and well-designed handguards. Unlike the R-One model, these S-One handguards do not have a full-length Picatinny rail. Why would you need one? This design, with short lengths of Picatinny rail only at the back and front top, allows the handguard to be lighter and handier. The mid-length version is only 5.47 ounces (plus 4.72 ounces for the mounting hardware).

The octagonal design also offers rows of M-LOK slots on the sides and bottom. The other four sides feature generous air vents to keep the heat down. The handguard is machined from 6061-T6 aluminum, a standard alloy in black rifle components. The coating is either a standard anodized black or an FDE Cerakote.

ATLAS stands for Aero Taper Lock Attachment System, a new and innovative system designed to make it easier to install your handguard. It also ensures even pressure across the custom-engineered barrel nut and provides great aesthetics.

Across the top of the handguard, there are indexing grooves to give you positive grip control. There are also quick-detach sling mounting points at the 3, 6, and 9 o’clock positions. This handguard is compatible with any mil-spec upper receiver and barrel. It requires a low-profile gas block.



  • Lightweight
  • M-LOK attachment slots
  • QD sling attachments
  • Strategically located Picatinny rail
  • Great fit and finish

Magpul MOE M-LOK HandGuard

Magpul is an Austin, Texas company that is the absolute leader in black rifle accessories. Everyone from sportsmen to law enforcement officers and special forces swear by their products, and the MOE handguard is no exception. These drop-in polymer handguards are lightweight yet robust. The mid-length model is a mere 8.7 ounces. They come in a variety of lengths for every gas system.

There are rows of M-LOK mounting points along the 2, 6, and 10 o’clock positions. If needed, you can attach a Picatinny rail to the M-LOK system. The military recently decided to go with M-LOK over rival mounting systems. The design can’t be beaten. The polymer is reinforced and heat-resistant. Plus, there is an integrated aluminum heat shield inside. This handguard is far lighter and more affordable than a free float aluminum alternative.

It works great with a front sight block. At the front end, a lower lip and extended sides provide an ergonomic, slip-free grip safe from barrel heat. If you need a tactical-quality handguard at a reasonable price, you will not beat the Magpul MOE. This is a handguard that you can use and abuse in rugged, real-life situations without a second thought. Plus, you have four tactical color options to choose from.

The Magpul MOE handguard goes great with a full set of high-quality Magpul components from sights to your rifle stock. All Magpul components are made in the USA.


  • Affordable
  • Lightweight
  • Very comfortable
  • M-LOK mounting system
  • 4 color options


  • Drop-in design may slightly affect the accuracy

Geissele Automatics AR-15 Mk14 Super Modular Rail Handguard

The Geissele MK14 Super Modular Rail tactical AR-15 handguard has a slim cross-section that makes it is ideal for shooters who use rail covers and/or a vertical grip – and who also employ the thumb-over-the-bore support hand grasp. The Geissele MK14 delivers acres of real estate for mounting accessories, with M-LOK slots running the handguard’s full length at the 3, 6, and 9 o’clock positions. The MK14 Super Modular Rail also sports an uninterrupted Picatinny rail running the full length of the top. Sockets for QD pushbutton sling swivels included at the 11 and 1 o’clock positions at the rear.

Geissele Automatics Operating out of North Wales, Pennsylvania, Geissele is the leader in after-market AR-15 triggers. All of their products are made in-state. The company offers an ever-expanding range of AR 15 components, including their Super Modular Rails. The key thing that makes this Geissele handrail stand out is the fit and finish. The quality of manufacturing is exceptional.

In the past, the Geissele MK4 handguards were real crowd-pleasers. These days, with the rise of M-LOK, shooters don’t need extra lengths of old-school Picatinny rail that the MK4 offers. The MK16 has a full-length Picatinny rail up top for that classic look and great optics mounting options. The other seven sides of the octagonal design are covered in M-LOK slots for modern accessory mounting.

Geissele has designed its own proprietary Barrel nut to make the installation of its handguards easier. The design also offers superior rigidity and reliability. You will not find a more rock-solid handguard. It will neither rotate nor betray any looseness whatsoever. The MK14 is made of standard 6061-T6 aluminum, like most black rifle components, but the quality of the machining here is unsurpassed. It is type-3 hard-coat anodized.


  • Slim cross-section
  • Tons of space for mounting accessories
  • Solid proprietary barrel nut design
  • M-LOK slots on 7 sides, full-length Picatinny rail up top

Midwest Industries G4 Lightweight ML-Series One Piece Free Float Handguard

Operating out of Wisconsin, Midwest Industries has long been a household name in the world of black rifles. Their G4 series of handguards is a go-to for competition or tactical shooting for many professionals.

This lightweight model skips a full-length top Picatinny rail for an extra row of M-LOK mounting slots. There are short lengths of Picatinny rail at the front and back of the top side. All 8 surfaces of this handguard are covered with rows of M-LOK slots. That gives you the most possible mounting points for components compatible with the most modern mounting system. This layout also helps to make this super-slim handguard very lightweight and easy to maneuver. You even get 5 anti-rotation quick-detach sling swivel sockets.

The Picatinny rails are made of MIL-STD 1913 steel and the body of the handguard is standard 6160-T6 aluminum alloy. This handguard is built to last a lifetime. All edges have been dehorned for smooth, comfortable operation. It features standard hard-coat anodization.

Midwest Industries follows the industry trend in designing its own proprietary barrel nut. It comes with a barrel nut wrench. It even has a patented torque plate system. Sleep easy knowing that Midwest Industries products are all 100% made in the USA and covered by their industry-leading lifetime warranty.


  • Light
  • 5 QD sling swivel sockets
  • M-LOK on 8 sides
  • Made in the USA
  • Lifetime warranty

Midwest Industries AR-15/M16 M-Series Two Piece Drop-In Handguard

Are you looking for a high-end, aluminum drop-in handguard from a very reputable manufacturer? This is it. Midwestern Industries has a legendary status among professional black rifle users. This model, in particular, has a very strong reputation. It isn’t the cheapest drop-in handguard out there, but it may well be the best quality. That’s backed up by a lifetime warranty. All Midwest Industries products are made in the USA.

You get a full length of Picatinny rail across the top and three rows of M-LOK slots at 3, 6 and 9 o’clock. The surfaces in between have huge circular cuts taken out of them for optimum weight and heat reduction. The mid-length version of this handguard weighs only 6.6 ounces.

The beauty of drop-in handguards is that you don’t need any special skills or tools to install them, this one only takes a couple of minutes to get on your rifle. It is made of standard 6061-T6 aluminum and the Picatinny rail is made of MIL-STD 1913 steel. As with the Midwest Industries G3, you get 5 quick-detach sling swivel sockets.

If you’re worried about drop-in handguards feeling a bit loose and sloppy, don’t, this is a top-quality model that locks up securely. If you want a no-nonsense, high-quality handguard with outstanding features, you can’t go wrong with the MI Two Piece Drop-In.


  • Full-length top Picatinny rail
  • Very light
  • M-LOK slots on three surfaces
  • 5 QD sling swivel sockets
  • Installation takes a couple minutes

BCM AR-15 BCM Gun Fighter MCMR Handguard M-LOK Free Float

Bravo Company was started in a veteran’s garage in Wisconsin in 2003. Since then it has come to dominate the market for high-quality AR-15 rifles and components. If you want only the best, Bravo Company Manufacturing should definitely be on your list. The MCMR is a very popular option for all AR-15 shooters no matter their use case, civilian or professional. For a pretty decent price you get one of the best-quality free float handguards on the market today.

Like many of the options on our list, BCM offers a proprietary steel barrel nut and lock up mechanism. This gives you a bomb-proof lockup and hassle-proof installation. Tolerances are very tight, so you may fight a bit to get it on, but that’s why you get an ultra-reliable lockup. It comes with the full range of hardware and tools you need for installation. The MCMR gives you the option of using a low-profile gas block or a front sight base.

You get a full-length Picatinny rail along the top and M-LOK attachment slots along the other 7 sides. The handguard has weight saving and heat dissipating vents cut out below the Picatinny rail.

With the hardware, the mid-length version weighs 8.8 ounces. It is made of industry-standard 6061-T6 aluminum that has been hardcoat anodized according to military specifications. In terms of high-end free float handguards, the MCMR is a bit more affordable than some alternatives in a similar quality bracket.


  • 7 rows of M-LOK slots
  • Comes with everything you need, tools and hardware
  • Full-length Picatinny rail
  • Proprietary free float barrel nut

Brigand Arms EDGE Handguard

If you’re the type of person who doesn’t like a lot of gimmicky bling hanging off the end of your rifle and you’d rather have something sleep and light, the Brigand Arms Edge handguard has your name on it.

This is a revolutionary design for the best AR-15 handguards that keeps the weight down to an incredible 4.08 ounces on the mid-length version. Brigand Arms achieves this with a patented braided carbon fiber design. We know, most shooters raise an eyebrow when they first see the EDGE. At first glance, it doesn’t say ‘robust.’ It looks like an autistic boy scout constructed it in his spare time, but believe you me, it is about as rugged and reliable as they come.

The EDGE has aluminum end caps, and, like so many free float handguards, a proprietary barrel nut design. It includes a steel jam nut that makes adjusting for alignment easy while offering rock-solid mounting. If need be, Brigand Arms offers a proprietary system for mounting lengths of Picatinny rail on the Edge handguard.

If you need the lightest option out there, or if just want a rifle that looks like it’s wearing gothic lingerie, the EDGE is for you.


  • As light as it gets
  • Unique aesthetics
  • Unsurpassed heat dissipation


  • Not cheap
  • No flat surface, hard to brace against an object

Faxon Streamline Carbon

Faxon is an Ohio company that is famous for its lightweight, high-end barrels. It has collaborated with Lancer Arms to design this, the Streamline Carbon handguard. It offers as rugged a design as you will find at an incredibly low weight. Including mounting hardware, the 10.2-inch model weighs a mere 6.24 ounces.

Faxon advertizes this handguard by noting that carbon fiber is ten times stronger than aluminum at less than half the weight. Sticking with the forward-thinking design, Faxon has skipped a top Picatinny rail and gone with M-LOK slots along all 8 surfaces of this handguard. This makes it perfect for mounting co-witnessing sighting systems.


Faxon has opted to go with the standard barrel nut and mounting system. This helps to keep weight down and offers peace of mind given how well-proven the design is. The barrel nut and hardware are all included. Installation only requires standard tools. Heat is not an issue with carbon fiber. Coupled with the lightness, that will help make for an extremely handy, maneuverable rifle. With its rounded edges, it is one of the most comfortable handguards you will ever use.

This isn’t the cheapest option out there, but you definitely get what you pay for. Many shooters will be shy of new, non-metal materials, but this carbon fiber handguard will last a lifetime or two.


  • Incredibly light
  • Uses a standard barrel nut
  • Low heat transfer
  • Very comfortable
  • M-LOK slots on 8 sides

Guide to Buying the Best AR-15 Handguards

An AR-15 handguard is similar to the forestock on a lever-action or a shotgun in that you hold it with your forward hand to steady the bore. It is called a handguard because it protects your hand from the heat that builds up in the barrel during sustained fire.

What Makes a Great Handguard?

Handguards come in several lengths and profiles to pair with your barrel and gas system. A good handguard should:

  1. Offer a solid grip
  2. Remain cool to touch despite sustained fire
  3. Protect your gas system
  4. Offer ample mounting points.

Unlike the average forestock on a traditional long gun, an AR-15 handguard wraps all the way around the barrel.

The original AR handguards were drop-in models made of synthetic material. They had an ergonomic design, with extra width at the bottom. A cylindrical, polymer design with ribs for grip became standard in the late 20th century.

Since the rise of the M4 carbine, free float handguards have started to dominate the market. They promise slightly better accuracy and more flexibility with sighting options. Yet they are harder to install and usually require low-profile gas blocks rather than the AR-15s iconic front sight base.

Types of AR-15 Handguards

There are two main types of best AR-15 handguards, free float and drop-in. Within these two categories, there is a range of design and mounting options.

Quad-rail handguards, with Picatinny rails on four sides, used to be popular before the rise of modern mounting systems. Picatinny rails are still common along the top, either full-length or at strategic locations. Some handguards are entirely cylindrical, without any mounting points at all.

Free Float Versus Drop-In Handguards

Which is the Best AR-15 Handguards? The question of whether to go with a free float or drop-in handguard depends on your personal priorities. For example, a drop-in handguard will generally be lighter than all but the most expensive, technologically advanced free float handguards. Drop-in handguards are usually cheaper than even the bottom-of-the-range free float models.

Drop-In Handguards

The drop-in handguard is the original design for the AR-15. They generally fit over your barrel, often in two pieces, between a delta ring and a front sight base.

Drop-in handguards are easy to install (hence the name), light, and generally more affordable than free float handguards.

On the downside, they often have a less exacting fit and finish and allow less heat to escape. Also, they may slightly hinder your accuracy because of contact with the barrel.

Free-Float Handguards

Free float handguards attach to the rifle with a barrel nut and make no contact with the barrel, giving you better accuracy. Usually, you are required to trade in your front sight base for a low-profile gas block that will fit underneath.

The best float handguards are well ventilated, especially with modern mounting slots. Better heat dissipation without compromising on grip. Aluminum is the most common material, helping free float handguards integrate seamlessly with the upper receiver

Free-Floats can cost ten times as much as drop-in handguards. These handguards tend to be much longer, providing more gripping area and a good resting surface. Also, allows for more mounting space.

Attachment Systems Used on AR 15 Handguards

What is the best ar 15 rail system? There are four common attachment systems for AR 15 handguards:

  1. Picatinny rail
  2. Quad Rail
  3. M-LOK
  4. KeyMod

Picatinny rails

Picatinny rails are very common, though not as much as they used to be as new, more ergonomic, streamlined options take over. Still, many outstanding sighting options are available for use with Picatinny rails so they are not going to disappear anytime soon. Today, you usually find them running the length of the top of the handguard. Sometimes, to save weight, only short strips are offered at the very front and very back.

Quad rail systems, with Picatinny rails along all four sides, are less common than they used to be. The modern quad rail that we are used to seeing started its life in 1995 when the design was sent to the Picatinny Arsenal for a lengthy test and evaluation period and would later come to be known as Mil-STD 1913. Some of our readers may not remember a time in history before red dot optics and AR-15’s downloaded with accessories and laser designators on them, but I assure you there was a time.

The Late 1990’s was an amazing time for gun owners, it was the first time that red dot style optics could be purchased on a working man’s wage and people began to use their AR-15’s like the Barbie doll of the gun world, all via the Picatinny style quad rail.

One thing is clearly evident, the Picatinny style quad rail is obsolete, people are abandoning the quad rail in favor of the Key Mod and the M-Lok systems.

You still find options that have short lengths of rail on all four sides at the front end. This gives you the option, for example, of mounting a sight, a light, a laser, and a bipod at the same time.

M-LOK Versus KeyMod

There has been a battle in the tactical firearms world among two systems of low-profile mounting slots, M-LOK and KeyMod.


This system has a modular offset design with keyhole-shaped mounting slots for flexible accessory placement. It’s lightweight, supports all kinds of attachment, and is super easy to install accessories.


M-LOK is similar to the KeyMod design, but it has elongated slots instead of keyholes and T-shaped lugs instead of circular ones. This gives two advantages to the KeyMod system.

  1. The M-LOK design lets you mount accessories anywhere along the length of the slot, whereas you can only mount on the rear, narrow end of a KeyMod rail.
  2. M-LOK has been proven to perform better than KeyMod. A study by U.S. SOCOM concluded that M-LOK ranks higher in repeatability, endurance, rough handling, drop testing, and failure load, compared to KeyMod.

Despite these two advantages, KeyMod is still much easier to install attachments than M-LOK and remains a high-quality system. In fact, because of the ease of use, KeyMod makes a great option for novice AR-15 shooters.

The Key Mod and the M-Lok are similar but different in some ways but still share some common traits with their predecessor the quad rail.

  • They are both available in free float and nonfree float configurations and that is about where the similarity ends between quad rails and the new generation of rails.
  • Both of the replacement systems offer the user a great deal of choice whether or not to install rail sections on selected areas of the tube. This lets users like myself have the flexibility of being able to install a tripod on their rifle and still have large areas of smooth material to slide their hands on.

Having been chosen by the US military, M-LOK can now be considered the winner over the more cartoony-looking KeyMod. According to military tests, when dropped, M-LOK accessories stay attached 100% of the time, while KeyMod accessories stay attached only 33% of the time. Both require an Allen wrench to mount accessories. As choosing one or the other is a bit of a commitment, the best advice is to go with the winning team here, M-LOK. However, it is worth noting that KeyMod components align perfectly automatically, unlike M-LOK ones. M-LOK already has three times the industry support and available components of KeyMod, and that lead is only likely to increase.

One of the nice things about these modern mounting slot systems is that they also act as excellent heat vents while, unlike a rail, reducing the weight of your handguard. Most handguards have an octagonal profile. You can find models with rows of mounting slots on all 8 sides, just on 3, or something in between. Another great benefit of mounting slots is that you can attach short lengths of Picatinny rail exactly where you need it, keeping weight down.

So readers, where are you at in the great debate? Quad rail ?, Team Key Mod ?, Team M-Lok ? or is there another dark horse in the race that we don’t know about? Drop us a line and let us know where you stand in the debate, maybe you are still using old M16A2 style handguards and iron sights.

Best AR-15 Gas Systems, Handguard Length, and Material Options

Handguard Length

There are 4 common lengths for AR 15 gas systems and handguards:

  1. Pistol: 4 inches
  2. Carbine: 7 inches
  3. Mid-length: 9 inches
  4. Rifle: 12 inches

Carbine length is the US military standard used on the M4 rifle. However, the carbine-length gas system is designed to work best with barrels shorter than 16 inches, which is the minimum length for civilian use in most jurisdictions.

Mid-length is the no-brainer option for civilian use. By putting the gas port closer to the muzzle, a mid-length system has less dwell time, the time the bullet spends between the gas port and the muzzle.

That reduces the rearward pressure inflicted on your rifle components, reducing wear and tear. I don’t know about you, but if I’m going to drop a grand or so on a product, I want it to last.

You will want to get a handguard that matches your gas system length. If you’re using a front sight block you won’t have any choice. If you use a low-profile gas block, it is possible to use a handguard that is longer than your gas system.

You may choose to do this for aesthetics or to get more gripping area. Getting the right grip will improve your rifle’s accuracy and maneuverability. Whatever you do, don’t use a handguard that exposes your gas system.

AR Handguard materials

The most common AR-15 handguard materials are:

  1. Aluminum
  2. Polymer
  3. Carbon fiber

If you want that old-school, mil-spec look, you could opt to go with a classic, cylindrical GI handguard. These iconic components are made of polymer and have an aluminum heat shield inside. Other polymer options exist, like the wildly popular Magpul MOE drop-in handguard. Polymer is generally the most affordable option. If designed right, like the GI model, a polymer handguard will serve you well in any scenario.

If sustained fire is a regular part of your weekend (or workday), you might prefer something that offers better heat dissipation. Most free float handguards are made of standard 6061-T6 aluminum. This is the same material used to make most AR-15 receivers. It offers a great combination of low weight and toughness. Today, most aluminum free float barrels are designed with as much venting for heat dissipation as possible. Modern mounting systems like M-LOK contribute to this.

A new option is carbon fiber. The strength to weight ratio of carbon fiber handguards is exceptional. These offer very forward-thinking aesthetics and usually a very ergonomic grip. However, they are definitely not the cheapest options out there.

Handguards often incorporate other materials for some of their components. You will find many steel barrel nuts and Picatinny rails. Steel is only used when that extra strength is mission-critical. You don’t want the excess weight it comes with on the front end of your weapon.

AR-15 Handguard Finishes

Aim Ar15 Free Float Quad Rail Installers

There are two main options in finishes for an aluminum handguard:

  • Anodized
  • Cerakote

Aim Sports Inc Ar-15 Free Float M-lok Handguard

At least 80% of the aluminum AR 15 handguards out there are anodized. This is an electro-chemical process than offers great protection. If you want to get pedantic, there are a variety of anodization methods out there, with the mil-spec Type-III hardcoat the most common. Anodized finishes are generally more durable than Cerakote. Plus, they are cheaper. Anodization is not a layer applied to the surface, rather it is a reaction with the aluminum itself.

Cerakote is a layer applied to the surface of your handguard. It is very durable and can over a unique, customizable aesthetic look. Compared to anodization, it is easier and safer to apply yourself if you end up going for a naked handguard to finish yourself.

If in doubt, go with an anodized handguard. There is a reason that it is the military standard. Plus, it has a more classic, tactical look.

What to consider when choosing an AR15 handguard

As you can see above, there is a lot to take in when it comes to AR 15 handguards. Here is a list of priorities to consider when choosing the best handguard for you, in descending order of importance:

  1. What length of gas system and type of gas block will you use?
  2. Do you prefer free float or drop-in?
  3. Is the handguard made by a reputable manufacturer?
  4. Does it offer you a comfortable, positive grip?
  5. Does it manage heat effectively?
  6. Does it give you the mounting options you need?
  7. Is it within your price range?
  8. Do you like its aesthetics?

Answering these questions will get you a long way toward zeroing in on the handguard you need. Remember, there is nothing wrong with having a few handguards for different use cases with the same rifle. Consider going with different upper receivers with different free float handguards. You can even have them in different calibers. Drop-in handguards are easier to swap out while sticking with the same upper receiver, but still give you plenty of flexibility.

Check out our AR-15 Handguard Removal Tool and Installation Guide

Staff quick-picks for the Best AR-15 Handguards

If you’re not sure what to choose and your weapon has a front sight base, go with the Magpul MOE for now. It is a massive upgrade on the classic GI handguard and you simply can’t go wrong. If you want a practical, top-quality free float model, the Aero Precision, Geissele, Midwest Industries G3 and Bravo Company options above are all spectacular. Personally, I swear by the G3. The Brigand Arms Edge is a great way to stand out, while the Faxon is a great balance of cutting-edge technology and practicality.

Aim Ar15 Free Float Quad Rail Install

Whichever handguard you choose, have fun, practice shooting as much as you can and remember, it’s the shooter, not the gun.