{"product_id":"cmmg-5-7x28mm-5-inch-barrel-bolt-carrier-group-kit-with-radial-delayed-blowback-57dbc33","title":"CMMG 5.7x28mm 5-Inch Barrel \u0026 Bolt Carrier Group Kit with Radial Delayed Blowback 57DBC33","description":"\u003ch2\u003eProduct Description\u003c\/h2\u003e\u003cp\u003eThe CMMG 5.7x28mm 5-inch Barrel and Bolt Carrier Group (BCG) Kit is built for creating an AR-platform pistol or short-barreled rifle (SBR) setup in 5.7x28mm. Using CMMGs patented Radial Delayed Blowback operating system, this kit helps reduce bolt carrier group weight and delivers less felt recoil compared to typical straight\/direct blowback systems, while still supporting features such as last round bolt hold open (when used with compatible components). Designed to assemble into a mil-spec AR-15\/Mk4 upper receiver, it can be used with a CMMG Mk57 lower receiver or a standard Mk4\/AR-15 lower when paired with CMMG 5.7 AR conversion magazines.\u003c\/p\u003e\u003ch2\u003eProduct Highlights\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eComplete barrel and BCG kit for AR-platform 5.7x28mm builds\u003c\/li\u003e\n\u003cli\u003ePatented CMMG Radial Delayed Blowback system for reduced felt recoil vs. straight blowback\u003c\/li\u003e\n\u003cli\u003eDesigned to fit mil-spec AR-15\/Mk4 upper receivers\u003c\/li\u003e\n\u003cli\u003eCompatible with CMMG Mk57 lowers or standard AR-15 lowers with proper conversion magazines\u003c\/li\u003e\n\u003cli\u003eBlack finish to match a wide range of AR builds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecs\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e CMMG\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 57DBC33\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 810097502390\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCaliber:\u003c\/strong\u003e 5.7x28mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarrel Length:\u003c\/strong\u003e 5 in\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor\/Finish:\u003c\/strong\u003e Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e 5-inch barrel and 5.7x28mm bolt carrier group\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating System:\u003c\/strong\u003e Radial Delayed Blowback\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlatform Compatibility:\u003c\/strong\u003e Mil-spec AR-15\/Mk4 upper; works with CMMG Mk57 lower or standard AR-15 lower (with CMMG 5.7 AR conversion magazines)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cem\u003eDisclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the products manufacturer.\u003c\/em\u003e\u003c\/p\u003e","brand":"CMMG","offers":[{"title":"Default Title","offer_id":44077114687610,"sku":"FLX-184852","price":428.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1679\/0365\/files\/283696465.png?v=1767637023","url":"https:\/\/tlooutdoors.com\/products\/cmmg-5-7x28mm-5-inch-barrel-bolt-carrier-group-kit-with-radial-delayed-blowback-57dbc33","provider":"TLO Outdoors","version":"1.0","type":"link"}