{"product_id":"proof-research-bolt-action-243-winchester-18-1-7-5-twist-4-groove-sendero-carbon-fiber-barrel","title":"Proof Research Bolt Action .243 Winchester 18\" 1:7.5 Twist 4-Groove Sendero Carbon Fiber Barrel","description":"\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThe \u003cstrong\u003e\u003cspan style=\"background-color: #ffff00;\"\u003eProof Research 104514\u003c\/span\u003e\u003c\/strong\u003e is a precision \u003cstrong\u003ebolt-action rifle barrel\u003c\/strong\u003e chambered in \u003cstrong\u003e\u003cspan style=\"background-color: #ffff00;\"\u003e.243 Winchester\u003c\/span\u003e\u003c\/strong\u003e, designed as a drop-in upgrade for custom rifle builds and a full-length replacement for worn factory barrels.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eFeaturing an \u003cstrong\u003e18-inch\u003c\/strong\u003e \u003cstrong\u003eSendero contour\u003c\/strong\u003e, this barrel is cut with a \u003cstrong\u003e1:7.5 twist\u003c\/strong\u003e and \u003cstrong\u003e4-groove\u003c\/strong\u003e rifling, stabilizing a broad range of projectile weights from light varmint loads through heavier hunting bullets. The assembled barrel measures \u003cstrong\u003e25.2 inches\u003c\/strong\u003e in total length, giving gunsmiths and builders a generous profile for predictable harmonics and consistent accuracy.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eConstructed with Proof Research's signature \u003cstrong\u003ecarbon fiber wrapped\u003c\/strong\u003e barrel technology, the 104514 weighs approximately \u003cstrong\u003e3.6 lbs\u003c\/strong\u003e and is rated up to \u003cstrong\u003e64% lighter\u003c\/strong\u003e than comparable traditional all-steel barrels. This advanced design delivers excellent heat dissipation during extended strings of fire and is engineered for precision shooting applications, making it an ideal choice for hunters and long-range shooters seeking reduced weight without sacrificing accuracy or barrel life.\u003c\/span\u003e\u003c\/p\u003e","brand":"Proof Research","offers":[{"title":"Default Title","offer_id":55077317771586,"sku":"195863","price":852.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0997\/7921\/5682\/files\/hires_05a537e2-27b0-41cd-9a8d-3b36efa845c8.png?v=1784757450","url":"https:\/\/centerfiresystems.com\/products\/proof-research-bolt-action-243-winchester-18-1-7-5-twist-4-groove-sendero-carbon-fiber-barrel","provider":"Centerfire Systems","version":"1.0","type":"link"}