Sons of Liberty Gun Works M4-L89 Upper Receiver Group 5.56 NATO 14.5" P&W Plan B

Sons of Liberty Gun Works M4-L89 Upper Receiver Group, Upper Receiver, 5.56 NATO, 14.5 Barrel with Pinned and Welded Plan B Flash Hider (16 OAL), Fits AR-15, Matte Finish, Black, Includes 13.75 L89 Rail, Does Not Include BCG or Charging Handle U-M4L89-556-145-PB Sons of Liberty Gun Works is a manufacturer of quality firearms and parts, perfect for your next build, next competition, or next line of defense. Their small parts fit most mil-spec firearms. These uppers are built with L89 7-sided rails, forged uppers, and Liberty Fighting Barrels. There are multiple options of lengths and muzzle devices.