Sons of Liberty Gun Works
M4-L89 Upper Receiver Group Caliber: .223 REM/5.56 NATO UPC: 657628673057 SKU: RSR|SOLGWU-M4L89-556-16-A2 MFR: U-M4L89-556-16-A2
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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.
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