{"product_id":"cmmg-bolt-carrier-group-mk3-308","title":"CMMG Bolt Carrier Group MK3 .308 – AR-10 Pattern Rifles","description":"\u003cp\u003eThe CMMG MK3 Bolt Carrier Group is engineered for .308 Winchester\/7.62 NATO AR-10 pattern rifles, delivering the reliability required for high-pressure large-frame platforms. Whether you're building a precision rifle from scratch, replacing a worn BCG, or keeping a spare on hand, this carrier group provides consistent cycling and extraction in DPMS-pattern rifles chambered in .308 Win and 7.62 NATO.\u003c\/p\u003e\u003cp\u003eManufactured from mil-spec materials with a phosphate finish for corrosion resistance and reduced friction, this BCG features proper staking and a chrome-lined interior for extended service life. The MK3 BCG is designed as a drop-in component for DPMS\/SR-25 pattern lowers and uppers, though headspace should always be verified when installing any bolt carrier group, especially in mixed-manufacturer builds or when replacing existing components.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Type:\u003c\/strong\u003e Bolt Carrier Group\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Firearms:\u003c\/strong\u003e AR-10\/DPMS Pattern .308 Win\/7.62 NATO Rifles\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Mil-Spec Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Phosphate\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Drop-In (Headspace Verification Recommended)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Bolt, Carrier, Gas Key, Cam Pin, Firing Pin, Retaining Pin\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CMMG","offers":[{"title":"Default Title","offer_id":47943494893823,"sku":"CMMG38BA423","price":293.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/0434\/3807\/files\/1255975.jpg?v=1766579354","url":"https:\/\/doublestackstore.com\/products\/cmmg-bolt-carrier-group-mk3-308","provider":"Double Stack Store","version":"1.0","type":"link"}