Upgrade your AR platform with the CMMG 16.1-inch 5.7x28mm Barrel Kit expertly engineered for enthusiasts seeking superior performance. This barrel and BCG kit harnesses the power of CMMG's innovative Radial Delayed Blowback system offering a significant reduction in felt recoil compared to traditional blowback systems. Its lightweight design does not compromise essential features like the last round bolt hold open. Crafted with a durable salt bath nitride finish this replacement barrel promises longevity and reliability. Perfectly compatible with Mk4 milspec AR15 uppers and CMMG 5.7 AR Conversion Magazines this kit is ideal for those looking to build a carbine length AR in the versatile 5.7x28mm caliber.