Sons Of Liberty Gun Works M4 EXO 300 AAC Blackout 13.9in BBL 13in EXO3 Rail NOX Brake

The M4-EXO 300 AAC Blackout 13.9'' BBL 13'' EXO3 Rail with NOX Brake from Sons Of Liberty Gun Works delivers a ready-to-build upper that pairs precision machining with rugged reliability for AR-15 platforms. This assembled upper receiver showcases a 13.9-inch mid-length barrel chambered in 300 AAC Blackout, finished in a durable black anodized coating, and features a 1/2-28 muzzle thread with a 1-7 twist to stabilize a range of subsonic and supersonic loads. The EXO3 Rail integrates seamlessly for a streamlined profile and enhanced rigidity while providing ample mounting real estate for accessories, ensuring balanced handling and improved heat dissipation during extended shooting sessions. The NOX brake further contributes to reduced recoil and muzzle rise, helping shooters maintain alignment for follow-up shots and quicker target reacquisition. Designed for AR-15 compatibility, this upper is ideal for MSR builds where versatility and reliability are paramount, whether you're precision shooting at the range, engaging in practical field scenarios, or configuring a hunting setup that benefits from the versatility of the 300 AAC Blackout chambering. With its anodized finish and robust construction, the M4-EXO3 upper is built to perform in demanding conditions.