{"product_id":"faxon-firearms-duty-series-gunner-ar-15-5-56-nato-13-9-barrel-black-nitride","title":"Faxon Firearms Duty Series Gunner AR-15 5.56 NATO 13.9\" Barrel - Black Nitride","description":"\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThe \u003cstrong\u003e\u003cspan style=\"background-color: #ffff00;\"\u003eFaxon Firearms Duty Series Gunner\u003c\/span\u003e\u003c\/strong\u003e is a standalone \u003cstrong\u003eAR-15 barrel\u003c\/strong\u003e chambered in \u003cspan style=\"background-color: #ffff00;\"\u003e\u003cstrong\u003e5.56 NATO\u003c\/strong\u003e\u003c\/span\u003e. Its \u003cstrong\u003e13.9\" barrel length\u003c\/strong\u003e and universal \u003cstrong\u003eAR-15 fit\u003c\/strong\u003e make it a purpose-built component for a mid-length direct-gas-system build, not a complete firearm or upper assembly.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eBuilt from \u003cstrong\u003e4150 chrome-moly-vanadium steel\u003c\/strong\u003e, this barrel uses \u003cstrong\u003econventional button rifling\u003c\/strong\u003e with a \u003cstrong\u003e1:8 twist\u003c\/strong\u003e. The Gunner contour keeps a Government-style taper from the barrel extension to the gas block, then transitions to a lighter Pencil-style contour forward of the gas block to balance mass and heat resistance at the rear with reduced weight toward the muzzle. A \u003cstrong\u003eblack nitride\u003c\/strong\u003e treatment is applied to the bore and exterior.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThe barrel features \u003cstrong\u003e1\/2x28 muzzle threads\u003c\/strong\u003e, an \u003cstrong\u003e11-degree target crown\u003c\/strong\u003e, and an \u003cstrong\u003eM4-pattern barrel extension\u003c\/strong\u003e. Its gas-block interface has a \u003cstrong\u003e0.625\" diameter\u003c\/strong\u003e, \u003cstrong\u003e1.9\" journal length\u003c\/strong\u003e, and \u003cstrong\u003e0.081\" gas port\u003c\/strong\u003e. Made in \u003cstrong\u003eUSA\u003c\/strong\u003e, each barrel is stress relieved, air-gauge tested, magnetic-particle inspected, and individually checked for headspace. This is a \u003cspan style=\"background-color: #ffff00;\"\u003e\u003cstrong\u003eNew\u003c\/strong\u003e\u003c\/span\u003e barrel component.\u003c\/span\u003e\u003c\/p\u003e","brand":"Faxon Firearms","offers":[{"title":"Default Title","offer_id":54988429951298,"sku":"169224","price":159.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0997\/7921\/5682\/files\/hires_3426498b-2d7d-42b8-b78d-4047b052381b.png?v=1784135366","url":"https:\/\/centerfiresystems.com\/products\/faxon-firearms-duty-series-gunner-ar-15-5-56-nato-13-9-barrel-black-nitride","provider":"Centerfire Systems","version":"1.0","type":"link"}