{"product_id":"cmmg-bolt-carrier-group-m16-556","title":"CMMG Bolt Carrier Group M16 5.56 – AR-15\/M16 Platform","description":"\u003cp\u003eThe CMMG M16 Bolt Carrier Group delivers reliable cycling and extraction for AR-15 and M16 platform rifles chambered in 5.56 NATO\/.223 Remington. This full-auto profile carrier provides increased mass over standard semi-auto carriers, contributing to smoother operation and improved reliability with a wide range of ammunition weights and gas system lengths. Ideal as a replacement BCG or for builders looking for proven performance in a new upper assembly.\u003c\/p\u003e\u003cp\u003eMachined from 8620 steel with a manganese phosphate finish on the carrier and a shot-peened Carpenter 158 steel bolt, this BCG is built to mil-spec dimensions for drop-in compatibility with standard AR-15 upper receivers. Gas key is properly staked. No gunsmithing required for installation—simply insert into upper receiver and charge. Includes ejector, extractor, firing pin, cam pin, and gas key pre-installed.\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-15, M16 (5.56 NATO\/.223 Rem)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCarrier Material:\u003c\/strong\u003e 8620 Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBolt Material:\u003c\/strong\u003e Carpenter 158 Steel, Shot-Peened\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Manganese Phosphate (Parkerized)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProfile:\u003c\/strong\u003e Full-Auto (M16)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Drop-In\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Bolt, Carrier, Firing Pin, Cam Pin, Ejector, Extractor, Gas Key (Staked)\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CMMG","offers":[{"title":"Default Title","offer_id":47934694523135,"sku":"CMMG55BA419","price":173.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/0434\/3807\/files\/1256414.jpg?v=1766476333","url":"https:\/\/doublestackstore.com\/products\/cmmg-bolt-carrier-group-m16-556","provider":"Double Stack Store","version":"1.0","type":"link"}