The Guntec USA BAR-10.5-GP 10.5" barrel combines cutting-edge engineering with a strikingly luxurious finish, ensuring an exceptional shooting experience. Crafted from durable 4150 chromoly steel and designed with M4 feed ramps, this barrel promises reliable feeding and superior performance. Its optimized 5.56x45 chambering and 1:7 twist make it the perfect choice for precision-driven shooters. 4150 Chromoly Steel M4 Feed Ramps Carbine Length Gas System 10.5" Length 5.56/.223 Chambered in 5.56x45 24K Gold Plated 1:7 Twist .750 Diameter 1/2 by 28 Thread This barrel enhances both the performance and aesthetics of your firearm.