{"product_id":"rosco-556nato-300blk-bcg-phos-blk","title":"Rosco Manufacturing 5.56 NATO \/ 300 BLK BCG – Phosphate Black","description":"\u003cp\u003eThe Rosco Manufacturing 5.56 NATO \/ 300 BLK Bolt Carrier Group is a mil-spec replacement or spare BCG designed for AR-15 platform rifles chambered in 5.56 NATO or 300 Blackout. This is a fully assembled, complete carrier group ready to install—ideal for builders completing a new upper or shooters stocking a spare for training and competition use. The phosphate finish provides proven corrosion resistance and reduces friction during cycling.\u003c\/p\u003e\u003cp\u003eMachined from 8620 steel with a properly staked gas key, this BCG is finished in black phosphate (parkerized) for durability under field conditions. Installation is drop-in for any mil-spec AR-15 upper receiver. Includes bolt, carrier, cam pin, and firing pin assembly.\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 platform rifles in 5.56 NATO and 300 Blackout\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e 8620 steel carrier, Carpenter 158 steel bolt\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Phosphate (black)\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, cam pin, firing pin, gas key (staked)\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Rosco Manufacturing","offers":[{"title":"Default Title","offer_id":47939680600319,"sku":"ROS-BCG-002","price":175.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/0434\/3807\/files\/2979837.jpg?v=1766545699","url":"https:\/\/doublestackstore.com\/products\/rosco-556nato-300blk-bcg-phos-blk","provider":"Double Stack Store","version":"1.0","type":"link"}