{"product_id":"fn-ar-15-5-56x45mm-nato-14-7-m4-profile-barrel","title":"FN AR-15 5.56x45mm NATO 14.7\" M4 Profile Barrel","description":"\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThe \u003cspan style=\"background-color: #ffff00;\"\u003e\u003cstrong\u003eFN AR-15 14.7\" M4 Profile Barrel\u003c\/strong\u003e\u003c\/span\u003e is a replacement barrel for \u003cstrong\u003eAR-15-pattern\u003c\/strong\u003e builds chambered in \u003cspan style=\"background-color: #ffff00;\"\u003e\u003cstrong\u003e5.56x45mm NATO\u003c\/strong\u003e\u003c\/span\u003e. Its chamber also accommodates \u003cstrong\u003e.223 Remington\u003c\/strong\u003e ammunition.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eBuilt with a \u003cstrong\u003e14.7 in\u003c\/strong\u003e \u003cstrong\u003eM4 profile\u003c\/strong\u003e and a \u003cstrong\u003ecarbine-length gas system\u003c\/strong\u003e, this barrel uses a \u003cstrong\u003e1:7 twist\u003c\/strong\u003e. An \u003cstrong\u003eM4-style barrel extension and feed ramps\u003c\/strong\u003e complete the AR-15-focused configuration.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eFN cold-hammer forges the barrel from proprietary high-grade \u003cstrong\u003echrome-moly-vanadium steel\u003c\/strong\u003e. The bore and chamber are \u003cstrong\u003echrome-lined\u003c\/strong\u003e to resist corrosion, heat erosion, and wear while supporting reliable chambering and extraction.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eA matte \u003cstrong\u003eblack manganese-phosphate finish\u003c\/strong\u003e provides external resistance to corrosion and oxidation. Each barrel is \u003cstrong\u003emagnetic-particle tested\u003c\/strong\u003e after forging to identify microscopic stresses or flaws.\u003c\/span\u003e\u003c\/p\u003e","brand":"FN","offers":[{"title":"Default Title","offer_id":54988442829122,"sku":"154339","price":311.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0997\/7921\/5682\/files\/hires_1be27e9f-3123-4f08-b3b9-1d60c4d031e8.png?v=1784136786","url":"https:\/\/centerfiresystems.com\/products\/fn-ar-15-5-56x45mm-nato-14-7-m4-profile-barrel","provider":"Centerfire Systems","version":"1.0","type":"link"}