{"product_id":"faxon-5-56-gunner-lw-9310-bcg-ntrd","title":"Faxon Firearms 5.56 Gunner Lightweight 9310 BCG Nitrided – AR-15","description":"\u003cp\u003eThe Faxon Firearms 5.56 Gunner Lightweight 9310 BCG is a reduced-weight bolt carrier group designed for AR-15 rifles in 5.56 NATO and .223 Remington. This BCG uses strategic material removal to reduce reciprocating mass without compromising structural integrity, resulting in faster cycling, reduced felt recoil, and less stress on buffer components. Ideal for competition shooters and those building lightweight carbines where every ounce counts.\u003c\/p\u003e\u003cp\u003eThe bolt is machined from 9310 steel—a nickel-chromium-molybdenum alloy known for superior toughness and fatigue resistance compared to standard Carpenter 158 steel. The entire assembly is treated with a nitrided finish, which diffuses nitrogen into the steel surface to create a wear-resistant, corrosion-resistant layer that holds up under high round counts. The nitride finish also reduces friction and simplifies cleaning. This is a drop-in component for mil-spec AR-15 upper receivers; no gunsmithing required. Properly headspaced and MPI tested.\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\u003eBolt Material:\u003c\/strong\u003e 9310 Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCarrier Material:\u003c\/strong\u003e 8620 Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Nitrided\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e Lightweight (Reduced Mass)\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, Retaining Pin\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Faxon Firearms","offers":[{"title":"Default Title","offer_id":47937884913919,"sku":"FXFF556BCGCNITRIDE-LW","price":231.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/0434\/3807\/files\/4962790.jpg?v=1766498914","url":"https:\/\/doublestackstore.com\/products\/faxon-5-56-gunner-lw-9310-bcg-ntrd","provider":"Double Stack Store","version":"1.0","type":"link"}