Sons of Liberty Gun Works Primary Arms Exclusive M4-76 5.56 NATO Rifle - 13.9"

SKU: M4-76-13.9PAE
MPN: M4-76-13.9PAE
2 Reviews

Out of Stock

Items that are regulated by the ATF have restrictions and requirements: 
•Your entire order will ship only to a Federal Firearm License holder.
•Please contact your local FFL prior to placing your order to ensure they are still accepting transfers. Due to Covid-19 many are no longer open
•A copy of your order/invoice as well as the current FFL license for your local dealer must be emailed to



The SOLGW M4-76 is a great entry level Complete AR-15 rifle that comes with all the features you want for a reliable, do-it-all carbine built for duty. This model features a 13.9” barrel machined from 4150 chrome moly vanadium steel and QPQ Nitride finished inside and out. Attached to the end of the barrel is a pinned and welded SureFire Warcomp to get the overall length to 16 inches. The six groove 1/7 twist rate is optimal for heavy 62 grain 5.56 NATO surplus ammunition. The Mid-length gas system and appropriate gas port size ensures reliable function under any conditions and minimal recoil. The government profile barrel and gas system are protected by the M76 free float handguard with M-LOK slots for full customization potential. Built exclusively for Primary Arms.

  • 13.9” 5.56 NATO barrel
  • Pinned and welded SureFire Warcomp
  • 4150 chrome moly vanadium steel
  • HPT and MPI
  • QPQ Nitride finish
  • 1/7 twist rate
  • Mid-Length gas system
  • 4140 steel .750” gas block
  • M76 M-LOK free float handguard
  • 1/2x28 threaded
  • 7075-T6 aluminum Cerra forged receivers
  • Rebellious Stripes lower receiver
  • Type III Class 2 hardcoat anodized black
  • Radian Raptor charging handle
  • Liberty Fighting Nickel Boron trigger
  • Magpul MOE grip
  • B5 Systems stock
  • Intermediate A5 buffer system
  • T-Marked upper
  • Dry film lube bolt carrier channel

The M76 handguard features the wedgelock barrel nut attachment system which is one of the most durable on the market. It also features 45° M-LOK slots at the front for more light and accessory mounting options. The upper receiver is made from 7075-T6 aluminum Cerra forgings and type III class 2 hardcoat anodized black. The upper receiver comes with the forward assist and dust cover assembled as well as an SOLGW BCG and Radian Raptor ambidextrous charging handle. The inside of the receiver has a dry film lube applied to decrease friction with the bolt carrier for smooth function.

The lower receiver is decked out with aftermarket furniture like the B5 Systems carbine stock and Magpul MOE pistol grip for better ergonomics than standard Mil-Spec equipment. It utilizes the intermediate A5 buffer system for optimal reliability and low recoil when combined with the mid-length gas system. It also features the Rebellious Stripes lower receiver engraving.

Sons of Liberty Gun Works is a custom rifle manufacturer in the United States that specializes on the AR-15 platform. They began producing purpose-built weapons for law enforcement and civilians alike and are given a lot of praise for focusing on the details that make an AR reliable. Function over form is what their rifles are known for and they are guaranteed to get the job done. From full rifles to individual parts, you can’t go wrong with SOLGW.
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Barrel CoatingSalt Bath Nitride
Barrel ContourGovernment
Barrel Length13.9
Barrel LiningSalt Bath Nitride
Barrel Material41V50 Chrome Moly Vanadium Steel
BrandSons of Liberty Gun Works
Caliber Gauge5.56 NATO
Gas System LengthMid-Length
Gas System TypeDirect Impingement
Muzzle DeviceSureFire Warcomp Pinned & Welded
Thread Pattern1/2 X 28
Twist Rate1:7

Ratings & Reviews

2 reviews

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SOLGW 13.9"


Limited edition rifle nearly identical to the12.7" M4-76, I own one of those too. This one came with a Surefire War Comp and a very thin shim on the 13.7" barrel to make 16" vs the SOLGW NOX and 12.7" barrel.
<br> Rifle shoots very softly with the A5 buffer system. It's gassed properly which is refreshing in a mostly overgassed industry. Runs like a scalded dog when shooting 5.56*. Rifle length is great for maneuvering around obstacles and transitioning in and out of vehicles. Absolutely love the trigger in this thing. Very clean break and nice reset.
<br> *If you plan to shoot .223 and or steel case plinking ammo plan on getting an A5H0 buffer with this one as the weak .223 didn't cycle the Rifle. I tried a variety of .223 and none of the brands would work. The buffer weight change and a peer check by the SOLGW customer service got me back straight.
<br> You cannot go wrong with a SOLGW product.

They’re out of stock everywhere for a reason


SOLGW is absolutely top notch in every sense of the word. If you’re familiar with them, I’m sure you’re already following them on IG. There’s details on this rifle you just don’t realize you’re getting until you’ve shot more “budget friendly” options. Down to even taking the slop out of the safety selector. I’ve put a few hundred rounds downrange so far with zero issues. If you’re torn between this and the 13.7, they’re identical other than muzzle device. This has the Surefire Warcomp which is slightly shorter than SOLGW Nox, hence the .2” difference in barrel length to get it to the 16”. You will not be disappointed with the rifle or the SOLGW family.