{"product_id":"fz-m16-m4-bcg-no-hammer-blk","title":"FailZero M16\/M4 BCG (No Hammer) – AR-15\/M16 Bolt Carrier Group","description":"\u003cp\u003eThe FailZero M16\/M4 Bolt Carrier Group delivers reliable cycling for AR-15 and M16 pattern rifles without the included hammer, making it ideal for builders who already have fire control components or prefer to source them separately. This BCG features FailZero's EXO nickel boron coating, which reduces friction and simplifies cleaning by preventing carbon buildup on critical surfaces. The M16 profile carrier provides full-auto compatibility and increased mass for improved reliability in various gas system configurations.\u003c\/p\u003e\u003cp\u003eMachined from Carpenter 158 steel with proper heat treatment, the bolt is MPI and HPT tested to mil-spec standards. The EXO coating is applied to all contact surfaces including the gas key, cam pin channel, and bolt face. Installation is drop-in for any mil-spec AR-15 upper receiver. This BCG requires standard AR-15 bolt carrier maintenance intervals but cleans significantly faster than phosphate or nitride finishes.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Type:\u003c\/strong\u003e Bolt Carrier Group (No Hammer)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Firearms:\u003c\/strong\u003e AR-15, M16, M4, 5.56 NATO\/.223 Wylde chambered rifles\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Carpenter 158 steel bolt, 8620 steel carrier\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e FailZero EXO Nickel Boron coating\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTesting:\u003c\/strong\u003e MPI and HPT tested\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Drop-in for mil-spec AR-15 upper receivers\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Bolt carrier, bolt assembly, cam pin, firing pin, gas key (staked), retaining pin\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"FailZero","offers":[{"title":"Default Title","offer_id":47937953923327,"sku":"FZ-M164-01-NH-BLACK","price":156.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/0434\/3807\/files\/1260829.jpg?v=1766499833","url":"https:\/\/doublestackstore.com\/products\/fz-m16-m4-bcg-no-hammer-blk","provider":"Double Stack Store","version":"1.0","type":"link"}