{"product_id":"proof-research-ar-style-barrel-308-win-20-1-10-twist-carbon-fiber-wrapped-sendero-5-8x24-threaded","title":"Proof Research AR-Style Barrel .308 Win 20\" 1:10 Twist Carbon Fiber Wrapped Sendero - 5\/8x24 Threaded","description":"\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThe \u003cstrong\u003e\u003cspan style=\"background-color: #ffff00;\"\u003eProof Research 100981\u003c\/span\u003e\u003c\/strong\u003e is a \u003cstrong\u003e\u003cspan style=\"background-color: #ffff00;\"\u003e.308 Winchester\u003c\/span\u003e\u003c\/strong\u003e AR-platform drop-in barrel built around a \u003cstrong\u003e20\"\u003c\/strong\u003e carbon-fiber-wrapped stainless steel blank, designed as a direct-fit upgrade for \u003cstrong\u003eSig-pattern AR-10 \/ AR-308\u003c\/strong\u003e rifles. The heavy \u003cstrong\u003eSendero\u003c\/strong\u003e contour provides the added barrel mass prized for hunting and precision applications, while the carbon-fiber wrap drops carry weight and accelerates cooling compared to a traditional all-steel blank.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eProof Research manufactures every barrel using \u003cstrong\u003esingle-point cut rifling\u003c\/strong\u003e, with each blank \u003cstrong\u003elead lapped\u003c\/strong\u003e and inspected at multiple quality-control stations. This 100981 configuration uses a \u003cstrong\u003e5-groove\u003c\/strong\u003e bore with a \u003cstrong\u003e1:10\u003c\/strong\u003e twist rate that stabilizes the standard spread of .308 Win bullet weights, and the muzzle is cut \u003cstrong\u003e5\/8\"-24\u003c\/strong\u003e for industry-standard muzzle devices and accessories.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eInstallation is straightforward, with a \u003cstrong\u003e2.5\" breech length\u003c\/strong\u003e and a \u003cstrong\u003e1.20\" shank diameter\u003c\/strong\u003e providing a secure, accurate fit in compatible upper receivers. The Sendero profile's added mass resists barrel whip and point-of-impact shift during sustained strings of fire, while the carbon-fiber-wrapped construction keeps the overall package manageable on an AR-10 platform.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eWhether you are upgrading an existing Sig-pattern AR-10 build or assembling a precision .308 Win rifle from a complete upper, the \u003cstrong\u003eProof Research 100981\u003c\/strong\u003e delivers the accuracy, weight savings, and durability of carbon-fiber-wrapped barrel technology in a turn-key drop-in package.\u003c\/span\u003e\u003c\/p\u003e","brand":"Proof Research","offers":[{"title":"Default Title","offer_id":55077455036738,"sku":"195872","price":852.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0997\/7921\/5682\/files\/hires_5fce0c40-3de9-4c70-b9dd-1528c5d26139.png?v=1784757588","url":"https:\/\/centerfiresystems.com\/products\/proof-research-ar-style-barrel-308-win-20-1-10-twist-carbon-fiber-wrapped-sendero-5-8x24-threaded","provider":"Centerfire Systems","version":"1.0","type":"link"}