The Tiger Rock Inc. BRPIS-S 5.56 NATO 7.5" barrel is engineered for ultimate precision and reliability, a must-have for serious AR-15 enthusiasts. Crafted from premium 4150 CMV steel, its stainless finish not only enhances durability but also ensures optimal performance. With a 1:7 twist rate, this barrel guarantees accuracy shot after shot. Length: 7.5" Pistol 5.56 NATO caliber 1:7 Twist rate .750" gas block diameter Pistol gas system with 0.07 gas hole diameter 1/2"x28 Thread Pitch Constructed from 4150 CMV steel Stainless finish for enhanced durability Made in the U.S.A. Compatible with AR-15 platforms Enhance your shooting performance with the unmatched quality of the Tiger Rock Inc. barrel.