Sons of Liberty Gun Works M4-76 5.56 NATO AR-15 Rifle – 13.9″

$1,749.00/0.05149474 0.05146532

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 EXPO/FCD 1215KM muzzle brake 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 ensure reliable function under any conditions and minimal recoil. The government profile barrel and gas system are protected by the M4-76 free float handguard with M-LOK slots for full customization potential.


  • 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
  • 1/2×28 threaded
  • 7075-T6 aluminum Cerra forged receivers
  • Type III Class 2 hard coat anodized black
  • Radian Raptor charging handle
  • Liberty Fighting Nickel Boron trigger
  • A5 buffer system
  • B5 Systems stock and pistol grip
  • T-Marked upper
  • Dry film lube bolt carrier channel

The M4-76 handguard 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 a 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 pistol grip for better ergonomics than standard Mil-Spec equipment. It utilizes the A5 carbine buffer system for optimal reliability and low recoil when combined with the mid-length gas system.

Sons of Liberty Gun Works is a custom rifle manufacturer in the United States that specializes in 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.

SKU: M4-76-13.9-XP Category: