Precision engineering meets exceptional performance with the Tiger Rock Inc. BRPIS-MICRO+GT-MICRO 5.56 NATO pistol length barrel. At just 5 inches and featuring a 1:5 5R twist, this barrel ensures enhanced accuracy for optimal shooting experiences. Constructed from durable 4150 chrome moly vanadium and coated with a protective black nitride finish, it is built to last. The proprietary Micro Pistol gas system paired with a stainless steel micro gas tube guarantees efficient cycling. Length: 5" Pistol 5.56 NATO 1:5 5R Twist .750" gas block diameter 1/2"x28 Thread Pitch Black Nitride finish Fits AR-15 platforms Made in the U.S.A. Elevate your shooting performance with this innovative barrel design from Tiger Rock Inc.