Sons Of Liberty Gun Works M4-EXO3 5.56 NATO AR-15 Rifle - 13.7" Pinned NOX

SKU: M4-EXO3-13.7
MPN: M4-EXO3-13.7
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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-EXO3 is a great entry-level complete AR-15 rifle with all the features you want for a reliable, do-it-all carbine built for duty. This model features a 13.7” 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 NOX 3-prong flash hider 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 EXO3 free float handguard with M-LOK slots for full customization potential.

  • 13.7” 5.56 NATO barrel
  • Pinned and welded NOX flash hider
  • 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
  • EXO3 M-LOK free float handguard
  • 1/2x28 threaded
  • 7075-T6 Aluminum Cerra forged receivers
  • Type III Class 2 hardcoat anodized black
  • Angry Patriot lower engraving
  • SOLGW Ambi 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 EXO3 handguard features 45° M-LOK slots at the front for more light and accessory mounting options. The upper receiver is comprised of 7075-T6 aluminum Cerra forgings and type III class 2 hardcoat anodized black. The upper receiver comes with the forward assist, dust cover assembled, and a SOLGW BCG and 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. It also features the Angry Patriot lower receiver engraving.
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Barrel CoatingSalt Bath Nitride
Barrel ContourGovernment
Barrel Length13.7
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
Handguard13.5 in M-LOK Rail
Magazine Capacity30
Muzzle DeviceSOLGW NOX Flash Hider
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

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