Sons of Liberty Gun Works M4-L89 5.56mm 12.5" Bbl Car Gas L89 Rail A2FH Liberty Fighting Bbl & Mil-Spec Upper Receiver U-M4L89-556-125-A2

The Sons of Liberty Gun Works Broadsword Billet/L89A Upper Receiver is a specialized precision assembly that combines the extreme rigidity of the Broadsword billet receiver with the enhanced tripod-ready features of the L89A handguard. This upper features a 14.5-inch Precision SPR 416R stainless steel barrel with three-groove polygonal rifling, optimized for high-accuracy performance with both 5.56 NATO and .223 Remington match ammunition. To ensure standard rifle compliance, the Huxwrx Flash Hider is permanently pinned and welded (P& W), providing a legal 16-inch overall barrel length while serving as a rock-solid host for Flow-series suppressors. The integrated ARCA rail on the base of the handguard ensures instant, secure mounting to tripods, making it a premier choice for precision shooters who value mobility and zero retention. Sons of Liberty Gun Works M4-L89 5.56mm 12.5" Bbl Car Gas L89 Rail A2FH Liberty Fighting Bbl & Mil-Spec Upper Receiver U-M4L89-556-125-A2