Sons of Liberty Gun Works Liberty Fighting Barrel Features The Sons of Liberty Gun Works Liberty Fighting Barrel uses 5R rifling in a 1:7 twist rate cut into 41V50 chrome-moly steel for a durable accurate barrel suited to hard training use. The chrome-lined bore resists wear and simplifies cleaning after extended firing sessions extending the service life of the barrel under high round counts. A DLC-coated barrel extension adds further wear resistance at the critical interface with the bolt carrier group. The .223 Wylde chamber gives the barrel the flexibility to run both 5.56 NATO and .223 Rem ammunition reliably. Finished in a black phosphate coating the barrel resists corrosion while standing up to the rigors of field and range use. Its medium contour and 11.5 length pair with a carbine-length gas system delivering reliable cycling in a compact AR-15 pistol or SBR build. The 1/2x28 threaded muzzle accepts a suppressor muzzle brake or flash hider to suit the builder s application. Designed as a direct fit for AR-15 platforms this barrel gives builders a durable accuracy-focused upgrade over a standard factory barrel. Sons Of Liberty Gun Works AR-15 Barrel Specifications Brand: Sons of Liberty Gun Works Model: Liberty Fighting Barrel Type: AR-15 Barrel Caliber: 5.56 NATO Barrel Length: 11.5 Thread Pattern: 1/2x28 Finish: Phosphate Color: Black Compatible Hosts: AR-15 Available At: GrabAGun