{"product_id":"rosco-manufacturing-bloodline-ar-15-m4-5-56-nato-16-m4-barrel-nitride","title":"Rosco Manufacturing Bloodline AR-15\/M4 5.56 NATO 16\" M4 Barrel - Nitride","description":"\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThe \u003cstrong\u003e\u003cspan style=\"background-color: #ffff00;\"\u003eRosco Manufacturing Bloodline\u003c\/span\u003e\u003c\/strong\u003e is a precision \u003cstrong\u003e\u003cspan style=\"background-color: #ffff00;\"\u003e5.56 NATO\u003c\/span\u003e\u003c\/strong\u003e drop-in barrel designed around the classic \u003cstrong\u003eM4 carbine\u003c\/strong\u003e contour and a full \u003cstrong\u003e16\"\u003c\/strong\u003e of usable barrel length. Sized for the \u003cstrong\u003eAR-15 \/ M4 platform\u003c\/strong\u003e, it is built to deliver the velocity, balance, and accuracy that carbine-length shooters expect from a duty-grade barrel.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eRosco machines the Bloodline from \u003cstrong\u003e4150 CMV steel\u003c\/strong\u003e and treats the bore and exterior with a tough \u003cstrong\u003eblack nitride finish\u003c\/strong\u003e for long service life, reduced friction, and easier cleaning. The slim M4 profile keeps the front of the rifle light and well-balanced, while the \u003cstrong\u003e1:7 twist rate\u003c\/strong\u003e stabilizes the full range of \u003cstrong\u003e5.56 NATO\u003c\/strong\u003e bullet weights, from light varmint loads up through heavier open-base match projectiles.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThis barrel is configured for a \u003cstrong\u003ecarbine-length gas system\u003c\/strong\u003e with a standard \u003cstrong\u003e1\/2x28\u003c\/strong\u003e muzzle thread, making it a direct replacement or upgrade for factory M4 carbine uppers. Properly sized gas ports are engineered to optimize cycling and reliability with a wide variety of ammunition and suppressor use.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eWhether you are assembling a new carbine build, refreshing a worn-out factory barrel, or building a lightweight defensive rifle, the \u003cstrong\u003eRosco Manufacturing Bloodline 16\" 5.56 NATO M4 barrel\u003c\/strong\u003e is a versatile, duty-ready choice.\u003c\/span\u003e\u003c\/p\u003e","brand":"Rosco Manufacturing","offers":[{"title":"Default Title","offer_id":55048690958658,"sku":"179465","price":146.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0997\/7921\/5682\/files\/hires_857e129f-c063-4d3c-b99f-03e430e4564a.png?v=1784702256","url":"https:\/\/centerfiresystems.com\/products\/rosco-manufacturing-bloodline-ar-15-m4-5-56-nato-16-m4-barrel-nitride","provider":"Centerfire Systems","version":"1.0","type":"link"}