{"product_id":"rosco-manufacturing-bloodline-ar-15-5-56-nato-12-5-barrel-nitride","title":"Rosco Manufacturing Bloodline AR-15 5.56 NATO 12.5\" Barrel - Nitride","description":"\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThe \u003cspan style=\"background-color: #ffff00;\"\u003e\u003cstrong\u003eRosco Manufacturing Bloodline 12.5\" M4 barrel\u003c\/strong\u003e\u003c\/span\u003e is a replacement barrel for the \u003cstrong\u003eAR-15 platform\u003c\/strong\u003e, chambered in \u003cspan style=\"background-color: #ffff00;\"\u003e\u003cstrong\u003e5.56x45mm NATO\u003c\/strong\u003e\u003c\/span\u003e. Rosco positions this configuration for compact intermediate patrol builds that fall between short SBR or pistol setups and RECCE-style platforms.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThis \u003cstrong\u003e12.5\" Government-profile barrel\u003c\/strong\u003e is machined from \u003cstrong\u003e4150 chrome-moly-vanadium steel\u003c\/strong\u003e and weighs \u003cstrong\u003e21.79 oz\u003c\/strong\u003e. Its \u003cstrong\u003e1:7 twist\u003c\/strong\u003e rifling is paired with an \u003cstrong\u003e11-degree crown\u003c\/strong\u003e. The barrel and barrel extension have a \u003cstrong\u003eblack nitride finish\u003c\/strong\u003e, and the bore is electro-polished after salt-bath nitriding.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThe barrel uses a \u003cstrong\u003ecarbine-length gas system\u003c\/strong\u003e with a \u003cstrong\u003e.750\" gas-block journal\u003c\/strong\u003e. Standard \u003cstrong\u003e1\/2x28 muzzle threads\u003c\/strong\u003e provide the specified interface for a compatible muzzle device.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThis barrel is offered in \u003cspan style=\"background-color: #ffff00;\"\u003e\u003cstrong\u003eNew Condition\u003c\/strong\u003e\u003c\/span\u003e. The package includes \u003cstrong\u003eone barrel\u003c\/strong\u003e.\u003c\/span\u003e\u003c\/p\u003e","brand":"Rosco Manufacturing","offers":[{"title":"Default Title","offer_id":54988233441602,"sku":"179459","price":136.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0997\/7921\/5682\/files\/hires_c52c1a69-488c-4fa8-9d21-607050a70e4e.png?v=1784129245","url":"https:\/\/centerfiresystems.com\/products\/rosco-manufacturing-bloodline-ar-15-5-56-nato-12-5-barrel-nitride","provider":"Centerfire Systems","version":"1.0","type":"link"}