Enhance your firearm's accuracy with the Tiger Rock Inc. BR377-S AR-300BLK/300AAC, a premier 7.5-inch pistol-length heavy barrel perfect for precision shooting. Crafted in the USA from high-quality 416R stainless steel, this barrel is engineered for longevity and consistent performance. The optimized 1:8 twist rate accommodates a variety of bullet weights, providing dependable accuracy across all shooting situations. Durable 416R stainless steel construction 1:8 twist rate for versatile bullet performance .750" gas block diameter with pistol gas system Enhanced reliability and reduced recoil 5/8" x 24 thread pitch for effortless suppression options Upgrade your AR-15 with the Tiger Rock BR377-S for unrivaled performance and durability.