{"product_id":"fn-ar-15-5-56x45mm-nato-18-rifle-length-cold-hammer-forged-chrome-lined-barrel","title":"FN AR-15 5.56x45mm NATO 18\" Rifle Length Cold Hammer Forged Chrome Lined Barrel","description":"\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThe \u003cstrong\u003e\u003cspan style=\"background-color: #ffff00;\"\u003eFN 36423 AR-15\u003c\/span\u003e\u003c\/strong\u003e barrel is an \u003cstrong\u003e18\" cold hammer forged\u003c\/strong\u003e replacement barrel chambered in \u003cstrong\u003e\u003cspan style=\"background-color: #ffff00;\"\u003e5.56x45mm NATO\u003c\/span\u003e\u003c\/strong\u003e (also fully compatible with .223 Remington). Manufactured by \u003cstrong\u003eFN America\u003c\/strong\u003e, this is the same hammer-forged barrel used on FN's factory AR-15 rifles, built to mil-spec dimensions for a drop-in fit on standard AR-15 upper receivers.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThe bore and chamber are \u003cstrong\u003echrome lined\u003c\/strong\u003e for extended service life and improved resistance to heat and corrosion, while the exterior is finished in a \u003cstrong\u003eblack manganese phosphate\u003c\/strong\u003e coating to match factory FN rifle specs. The barrel is gas-ported for a \u003cstrong\u003erifle length gas system\u003c\/strong\u003e and is designed to work with a standard \u003cstrong\u003e.750\" gas block\u003c\/strong\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eMuzzle threading is \u003cstrong\u003e1\/2x28\u003c\/strong\u003e for direct compatibility with the vast majority of 5.56 muzzle devices, flash hiders, brakes, and suppressors. Whether you are building a precision AR-15, refreshing a worn upper, or assembling a custom rifle-length carbine, this \u003cstrong\u003e\u003cspan style=\"background-color: #ffff00;\"\u003enew, unused factory replacement barrel\u003c\/span\u003e\u003c\/strong\u003e is a high-quality foundation for any 5.56 AR-15 project.\u003c\/span\u003e\u003c\/p\u003e","brand":"FN","offers":[{"title":"Default Title","offer_id":55107981640002,"sku":"154343","price":311.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0997\/7921\/5682\/files\/hires_38513572-b263-4e45-b151-58a8802f5d98.png?v=1784801532","url":"https:\/\/centerfiresystems.com\/products\/fn-ar-15-5-56x45mm-nato-18-rifle-length-cold-hammer-forged-chrome-lined-barrel","provider":"Centerfire Systems","version":"1.0","type":"link"}