{"product_id":"cmmg-bbl-and-bcg-kit-8-5-7x28mm","title":"CMMG - Barrel and BCG Kit, 8\" 4140CM, SBN, 5.7x28mm","description":"\u003cp\u003eThe \u003cb\u003eCMMG 8\" 5.7x28mm Barrel and BCG Kit\u003c\/b\u003e is an essential component for building an AR pistol or SBR using CMMG’s innovative Radial Delayed Blowback operating system. This system not only reduces the weight of your bolt carrier group but also minimizes felt recoil compared to traditional straight blowback systems. It retains key features such as last round bolt hold open, enhancing your shooting experience.\u003c\/p\u003e\u003cp\u003eDesigned to integrate seamlessly into a Mk4\/mil-spec AR15 upper, this kit is compatible with both CMMG Mk57 lower receivers and Mk4\/AR15 mil-spec lower receivers when paired with CMMG 5.7 AR Conversion Magazines. This makes it a versatile choice for any AR enthusiast looking to utilize the 5.7x28mm caliber.\u003c\/p\u003e\u003cp\u003eAll CMMG products, including this barrel and BCG kit, come with a Lifetime Quality Guarantee, ensuring reliability and performance.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eKey Features\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eCaliber:\u003c\/b\u003e 5.7x28mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eBarrel Length:\u003c\/b\u003e 8 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMaterial:\u003c\/b\u003e 4140CM steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eFinish:\u003c\/b\u003e Salt Bath Nitride (SBN)\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eOperating System:\u003c\/b\u003e Radial Delayed Blowback\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCompatibility:\u003c\/b\u003e Works with CMMG Mk57 and Mk4\/AR15 mil-spec lower receivers\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eIncludes:\u003c\/b\u003e Barrel and Bolt Carrier Group (BCG)\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eWeight:\u003c\/b\u003e 2.5 lbs\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eColor:\u003c\/b\u003e Black\u003c\/li\u003e\n\u003cli\u003e\u003cb\u003eLifetime Quality Guarantee\u003c\/b\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eSpecifications\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eType:\u003c\/b\u003e Barrel\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eManufacturers Part Number:\u003c\/b\u003e 57D88C3\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eProduct UPC:\u003c\/b\u003e 810097502406\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eSubCategory:\u003c\/b\u003e Barrels\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CMMG","offers":[{"title":"Default Title","offer_id":47391112429657,"sku":"RSR-CMMG57D88C3","price":537.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0595\/9860\/2329\/files\/cmmg_RSR-CMMG57D88C3-1.jpg?v=1791361973","url":"https:\/\/mountainready.online\/products\/cmmg-bbl-and-bcg-kit-8-5-7x28mm","provider":"mountainready.online","version":"1.0","type":"link"}