Sons of Liberty Gun Works M4-EXO2 300 Blackout Barreled AR-15 Upper Receiver - 9"

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Note: This barreled upper receiver assembly has a barrel length under 16” and is therefore subject to all NFA rules and regulations. Know your local laws before purchasing.

The Sons of Liberty Gun Works M4-EXO2 is a great entry level AR-15 barreled upper receiver. It features a 9” barrel machined from 4150 chrome moly vanadium steel and QPQ Nitride finished inside and out for optimal durability and wear resistance. The pistol length gas system ensures reliable function in all conditions with minimal recoil. The M4-EX02 .300 Blackout barrel and pistol length gas system are protected by the EXO2 free float handguard with M-LOK slots for the attachment of accessories, making it an extremely customizable upper. The EXO-2 handguard securely attaches to the M4 flat top upper receiver with a steel barrel nut that prevents rotation or loosening of the handguard. The upper receiver is made from 7075-T6 aluminum Cerra forgings and type III hard coat anodized finish in black. The upper receiver comes with the forward assist and dust cover assembled but does not come with a BCG or charging handle. The inside of the receiver has a dry film lube applied to decrease friction with the bolt carrier for smooth function.

  • 9” barrel
  • .300 Blackout
  • 4150 chrome moly vanadium steel
  • HPT and MPI
  • QPQ Nitride finish
  • Pistol length gas system
  • 4140 steel .750” gas block
  • EXO-2 M-LOK free float handguard
  • 5/8x24 with A2 flash hider
  • 7075-T6 aluminum Cerra forged receiver
  • Type III Class 2 hardcoat anodized black
  • T-Marked upper
  • Dry film lube bolt carrier channel

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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AssemblyBarreled Assemblies
Barrel CoatingSalt Bath Nitride
Barrel ContourHeavy
Barrel Length9
Barrel LiningSalt Bath Nitride
Barrel Material41V50 Chrome Moly Vanadium Steel
BrandSons of Liberty Gun Works
Caliber Gauge300 Blackout
Gas System LengthPistol
Gas System TypeDirect Impingement
Handguard8.5 in. M-LOK Rail
Muzzle DeviceA2 Flash Hider
Thread Pattern5/8 X 24
Twist Rate1:7

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