Ideal for both pistols and SBRs, Brownell's Hybrid barrel is designed to be the ideal barrel for lightweight versatile weapons. Set at 11.5" length balancing velocity to weapon maneuverability, our 11.5" lightweight barrel is manufactured with a carbine length gas system. Gas block journals are 1.9" long and .625" diameter for compatibility across any gas system piston or DI. The barrels are 100% percent full-auto and suppressor rated with concentric 1/2×28 threads, complete with relieved shoulder. For maximum reliability and accuracy, we feature a 5.56 NATO chamber with 1/8 twist conventional rifling. 4150 GBQ, Fully Stress Relieved Stee Mfg: Brownells
