The Bravo Company BCM Mk12 18 inches stainless steel barrel kit is a premium upgrade for your AR-15, offering the same high-performance barrel found on BCM's renowned Precision rifles. This kit is designed for seamless installation, featuring a BCM low-profile gas block and a gas tube, ensuring a straightforward enhancement to your firearm. Crafted from robust 410 stainless steel, this barrel offers superior corrosion resistance compared to the more commonly used 416 stainless alloy, providing longevity and reliability in various conditions. The barrel is further enhanced with a durable, abrasion-resistant IonBond PVD finish, reducing friction and extending its lifespan. The BCM Mk12 barrel is engineered with a 5.56x45mm match (USMC SAM-R) chamber, paired with meticulously hand-lapped 1-8 inches button rifling, delivering exceptional accuracy and precision. The inclusion of M4-type feed ramps ensures smooth and reliable feeding of rounds into the chamber, enhancing the overall performance and dependability of your rifle. Whether for competitive shooting or tactical applications, the Bravo Company BCM Mk12 18 inches stainless steel barrel kit is an ideal choice for those seeking to elevate their AR-15's capabilities. Phosphate-coated, military specification, low-profile gas block Rifle length gas system designed for smoother and more reliable cycling The 18 inches length provides a balance of compactness and increased velocity, enhancing long range performance Outer diameter at gas port - 3/4 inches Barrel extension is included and pre-installed 1/2-28 TPI muzzle threads