{"product_id":"tacfire-ss-rk556-lpk-ar-15-lower-parts-kit-5-56-nato-223-rem-16-barrel-black-nitride","title":"TacFire SS-RK556-LPK AR-15 Lower Parts Kit 5.56 NATO \/ .223 Rem 16\" Barrel Black Nitride","description":"\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThe \u003cstrong\u003e\u003cspan style=\"background-color: #ffff00;\"\u003eTacFire SS-RK556-LPK\u003c\/span\u003e\u003c\/strong\u003e is an \u003cstrong\u003eunassembled AR-15 rifle build kit\u003c\/strong\u003e chambered in \u003cstrong\u003e5.56x45mm NATO\u003c\/strong\u003e \/ \u003cstrong\u003e.223 Remington\u003c\/strong\u003e, bundling the major upper and lower components a builder needs to complete a mil-spec semi-automatic carbine from a stripped lower receiver.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eAt the core of the kit is a \u003cstrong\u003e16-inch M4 contour barrel\u003c\/strong\u003e finished in \u003cstrong\u003e\u003cspan style=\"background-color: #ffff00;\"\u003eBlack Nitride\u003c\/span\u003e\u003c\/strong\u003e and threaded \u003cstrong\u003e1\/2\"-28\u003c\/strong\u003e to accept a standard .223\/5.56 muzzle device or suppressor mount. A \u003cstrong\u003e1:8 twist rate\u003c\/strong\u003e stabilizes the full spread of .223 and 5.56 bullet weights. A birdcage flash hider and crush washer are included for out-of-the-box muzzle readiness.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThe barrel is paired with a \u003cstrong\u003e15-inch M-LOK free-float handguard\u003c\/strong\u003e for a slim, lightweight profile and modern accessory mounting. Combined with the included upper receiver components and the \u003cstrong\u003eUSA-made lower parts kit\u003c\/strong\u003e, the SS-RK556-LPK delivers the major parts required to assemble a custom AR-platform rifle.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThe \u003cstrong\u003elower parts kit\u003c\/strong\u003e ships with \u003cstrong\u003emil-spec components\u003c\/strong\u003e for the fire control group, magazine catch, bolt catch, safety selector, buffer retainer, and pistol grip, along with the springs, detents, and pins needed for assembly. A \u003cstrong\u003emil-spec trigger\u003c\/strong\u003e comes standard. The \u003cstrong\u003esemi-automatic\u003c\/strong\u003e action is built around the standard AR-15 platform and is compatible with any mil-spec stripped lower receiver.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eConstructed from \u003cstrong\u003ealuminum\u003c\/strong\u003e components with a uniform matte black finish, the SS-RK556-LPK is a turnkey bundle for first-time builders, gunsmiths, or anyone assembling a custom AR-15 rifle. \u003cstrong\u003eStripped lower receiver and buttstock assembly are not included.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"TacFire","offers":[{"title":"Default Title","offer_id":54996492026178,"sku":"113836","price":342.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0997\/7921\/5682\/files\/hires_de936cec-ff10-48c3-b3a8-8a2cc02fc52f.png?v=1784320769","url":"https:\/\/centerfiresystems.com\/products\/tacfire-ss-rk556-lpk-ar-15-lower-parts-kit-5-56-nato-223-rem-16-barrel-black-nitride","provider":"Centerfire Systems","version":"1.0","type":"link"}