The Guntec USA 16" 5.56mm 1:8 Twist M4 4150 Barrel is engineered for high performance, catering to both professionals and shooting enthusiasts. Constructed from premium 4150 Chromoly Steel, it guarantees reliability across various shooting conditions. Optimized for 5.56x45 ammunition, this barrel excels at stabilizing multiple bullet types. Its M4 contour profile strikes the perfect balance between lightweight agility and structural strength, enhancing your firearm's overall performance. Chambered for 5.56x45, including .223 Remington 1:8 twist rate for superior bullet stabilization M4 contour for lightweight handling and toughness .750 gas platform for smooth cycling Spiral-engraved markings for identification M4 feed ramps for reliable feeding 1/2 by 28 threaded muzzle for customization Corrosion-resistant stainless steel finish Enhance your firearm setup with the Guntec USA 16" barrel, the perfect blend of precision and durability.