Drop in Heavy Muzzle stainless steel barrel features match bore and chamber dimensions. It features a 1:9" twist that is designed to shoot the 60 gr SSS ammo. The barrel features our unique chamber designed for optimum accuracy and functioning. Drilled & tapped to accept Volquartsen barrel mounted scope mount. Made of stainless steel, 18.5" long, bull barrel, weighs approx 3lb 4oz.