{"product_id":"lbe-556-bolt-carrier-group-nib","title":"LBE Unlimited 5.56 Bolt Carrier Group – Nickel Boron Finish","description":"\u003cp\u003eThe LBE Unlimited 5.56 Bolt Carrier Group delivers reliable cycling for AR-15 platform rifles. This replacement or spare BCG is machined to mil-spec dimensions for drop-in compatibility with standard AR-15 uppers chambered in 5.56 NATO and .223 Remington. The nickel boron finish provides enhanced lubricity and corrosion resistance compared to standard phosphate coatings, reducing friction during operation and simplifying cleaning after extended firing sessions.\u003c\/p\u003e\u003cp\u003eThe bolt carrier is machined from 8620 steel with a nickel boron coating, while the bolt is made from 9310 steel for strength in the locking lugs. The finish's self-lubricating properties mean less oil is required for reliable function. Installation is straightforward drop-in for anyone familiar with AR-15 field stripping—no gunsmithing required. The BCG includes a fully assembled carrier, bolt, cam pin, firing pin, and firing pin retaining pin.\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, 5.56 NATO, .223 Remington\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 9310 Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Nickel Boron (NiB)\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 Carrier, Bolt, Cam Pin, Firing Pin, Firing Pin Retaining Pin\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"LBE Unlimited","offers":[{"title":"Default Title","offer_id":47938103017727,"sku":"LBM16BCG-NIB","price":154.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/0434\/3807\/files\/1274162.jpg?v=1766501487","url":"https:\/\/doublestackstore.com\/products\/lbe-556-bolt-carrier-group-nib","provider":"Double Stack Store","version":"1.0","type":"link"}