SOLGW M4-76 5.56 NATO AR-15 Rifle - 13.9"

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

In Stock

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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.
•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 rifle is the one you want to get if you can only have 1. Sons of Liberty Gun Works is determined to build the most reliable AR-15 rifles with everything you need or want right out of the box, so you won't have to waste more money upgrading parts down the line like you would have to do with lesser rifles. The heart of the SOLGW M476 is the popular 13.9" barrel length with a pinned and welded muzzle device giving you the shortest possible configuration without needing a tax stamp. While a standard 16" barrel with muzzle device is only slightly longer, those couple inches that have been removed allow the handguard to also be shorter helping to reduce weight and making this a handy carbine that is noticeably more maneuverable. The muzzle device that SOLGW has chosen for this particular AR-15 is the Expo Arms/Forward Controls Design single chamber muzzle brake that is compatible with the Dead Air Sandman KeyMount suppressors. The mid-length gas system helps to increase dwell time making this an extremely smooth shooting rifle even when paired with a suppressor. If you can only buy one rifle, or you simply just want to add one of the best to your collection, you can't go wrong with Sons of Liberty Gun Works.

  • 13.9” 5.56 NATO barrel
  • Pinned and Welded Expo Arms / Forward Controls Design 1215 Single-Chamber Muzzle Brake
  • Dead Air Sandman Keymount suppressor compatible
  • 4150 chrome moly vanadium steel
  • HPT and MPI
  • QPQ Nitride finish
  • 1/7 twist rate
  • Mid-Length gas system
  • 4140 steel .750” gas block
  • M4-76 M-LOK free float handguard
  • 1/2x28 threaded
  • 7075-T6 aluminum Cerra forged receivers
  • Type III Class 2 hard coat anodized black
  • Ambidextrous charging handle and safety selector
  • Liberty Fighting Nickel Boron trigger
  • A5 buffer system
  • B5 Systems stock and pistol grip
  • T-Marked upper
  • Dry film lube bolt carrier channel

Like the name suggests, this 5.56 rifle comes with the M4-76 free float handguard. This handguard features one of the most durable attachment systems known as the wedge lock that increases the surface area that interacts with the barrel nut for an extremely rigid lockup that won't come loose. Additionally, the M-LOK slots allow you to easily configure your rifle for any mission and the full length top picatinny rail allows you to securely mount critical equipment like back up sights or aiming lasers.

The upper and lower receivers are forged from 7075-T6 aluminum and are mostly Mil-Spec components for reliability except for the ambidextrous safety selector, ambi charging handle, Nickel Boron trigger, and an enlarged trigger guard.

Additionally, it is outfitted with a B5 Systems carbine stock and pistol grip for improved ergonomics and an A5 buffer system for a longer bolt travel which also helps to improve reliability as well as reduce felt recoil. The bolt carrier group is Nitride finished as well as magnetic particle inspected and high pressure tested.
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Barrel CoatingSalt Bath Nitride
Barrel ContourMedium
Barrel Length13.9
Barrel LiningSalt Bath Nitride
Barrel Material41V50 Chrome Moly Vanadium Steel
BrandSons of Liberty Gun Works
Caliber Gauge5.56 NATO
FinishHardcoat Anodized
Gas System LengthMid-Length
Gas System TypeDirect Impingement
Handguard12.5 in M-LOK Rail
Magazine Capacity30
Muzzle DeviceExpo Arms/FCD Extended Single Chamber Muzzle Brake Keymo Mount
Thread Pattern1/2 X 28
Twist Rate1:7
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to

Ratings & Reviews

2 reviews

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by -

Great shooting rifle at a good price. It is very accurate and feels well built. Always nice to see a company stand behind their products.
<br> Primary Arms is also a great company to work with. I couldn't have asked for a better experience.

Top tier blaster

by -

I decided to upgrade my AR game and after researching, I decided to go with a SOLGW. I debated on the M4-76 and the M4-89, opting to go with this 13.9" '76. So far I couldn't be happier. Finish, feel, action, gassing, and accuracy are all I hoped they would be. The SOLGW package with the soft case, Duramags (thought they had their own brand though), swag, Constitution, and lifetime warranty is fantastic. Primary Arms had the best price that I could find. The shipping was faster than anticipated, and everything arrived at my FFL in great shape. I had a small issue with a coupon code and Sandra from Customer Service solved my issues quickly. Overall an excellent product and buying experience. Thanks PA!