Radical Firearms Gen 3 M-LOK Handguard Primary Arms Exclusive - 15"

Manufactured by Radical Firearms
Manufactured by Radical Firearms
27 Reviews

In Stock

Standard orders will ship out in 1 business day (M-F) if ordered by 3:30 pm CST. FFL orders will ship within 5 business days or less as long as we have the information for the transfer destination. NFA items will take longer to ship and are dependent upon ATF processing times.

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The Radical Firearms Primary Arms exclusive rail system is a lightweight and comfortably slim handguard ideal for shooters wanting to keep unnecessary ounces off their rifle build. Each rail is precision machined from high-strength 6061-T6 aluminum and features a tough hardcoat anodized finish. With a comfortable 1.375" internal diameter, seamless top-rail, and heavy duty 4140 steel barrel nut, this M-LOK compatible handguard is an excellent option for your next build.

  • 6061-T6 aluminum construction
  • 15" handguard will cover rifle length gas systems
  • Full length M1913 Picatinny Top Rail
  • Rigid design with 4140 steel barrel nut
  • M-LOK design compatible with your favorite accessories
  • 3rd generation mounting system
  • Made in Stafford, Texas!

The ergonomic freefloat Primary Arms exclusive handguard features a monolithic M1913 picatinny top rail for your favorite sights, optics, and accessories. Anti-rotation tabs interface with MIL-SPEC upper receivers to ensure optimal alignment of the top rail. The 3rd generation mounting system offers impressive rigidity to reduce deflection when bracing against barriers or shooting from a bipod, and clamps to a strong 4140 chromoly vanadium steel barrel nut.

Based out of Stafford, Texas, Radical Firearms got their start producing quality affordable firearms and accessories. With a wide selection of AR-15s in popular chamberings, they are certain to produce the rifle or AR pistol you’re looking for at a price you can afford. Best of all, Radical Firearms offers an exclusive lifetime warranty on all of their products as long as you own them!
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BrandRadical Firearms
FinishHardcoat Anodized
Handguard Length15

Ratings & Reviews

27 reviews


Awesome free float rail

by -

I am more then impressed with this free float rail. I don't have experience with Radical Firearms parts until now. It fits the barrel nut like a glove and was easy to install. No more timing the barrel nut for the gas tube. Mine has no sharp edges and is well made. My M Look accessories fit like a glove. What impressed me the most was when I bought mine I got it on sale. This rail is light weight and solid. Being a Texan, it is made in Texas and PA being a Texas company makes it four thumbs up. It looks awesome on my Rifle.

Good luck. Hope yours works better than mine did.

by -

Total waste of time. The hand guard would not fit the barrel nut provided properly. You could not put enough tension on the bolts across the split to actually grip the nut and the forward bolt that assists in locking the guard to the nut did very little to help anything. Even with enough stress to nearly strip the bolt heads it had enough play in the guard to make contact with a gas block with marginal finger pressure. Even a cheaper Aim Sports hand guard holds far better than this. Don't think I can even return it at this point. Wish I had gotten a chance to try it sooner.

15" Handguard

by -

I had a round handguard on a older AR. I wanted the rail and M-Lock to attach a set of pop up sights and this worked really well for me. It went on easy and seems to be holding up after a few range trips.

Still kickin’ it


7 month update - I’m still as happy with this rail as the day I installed it on my rifle, it has a little road rash which is to be expected since I don’t baby my firearms. When I installed it I used blue lock tight and all is still well with that. Since installing this budget friendly free floating I am able to shoot 1/2” grouping with Sierra match king from a bench. Outstanding craftsmanship, fit and finish. Still happy with it.

A decent handguard Rail

by -

Overall it's a good rail for AR rifle build the color is a little bit off but overall it's a very strong rail and it does look good on the rifle in the end. Best to have a gunsmith install it for best results.

Comfortable, nice handrail for the price

by -

Got this in sale. Very nice quality for the price.
The rounded contours make it much more comfortable to hold than most other rails. Mounting nut and screws look plenty sturdy. I would buy it again.


by -

Shipped fast. Arrived within 4 days of ordering. Awesome handguard. Extremely light and easy install. Liked the first one so much, had to order more the day it arrived. Highly recommend this handguard.

Qd mounts

by -

Could use 1-4 Qd mounts.. lol other than that just a good quality product well-built simple assembly also

Excellent Handguard

by -

Fit great and is a really well built handguard.

Perfect AR handguard

by -

This handguard is the one for you. Just install the barrel nut according to instructions. No shims to mess with. Self aligning. Be sure not to forget that anti seize compound. A little goes a long way!!! You can't miss with this purchase.