{"product_id":"ballistic-bbl-5-56-18-spr-ops12-pro","title":"Ballistic Advantage 18\" SPR Profile Barrel – 5.56 NATO, Ops 12 Rifle Gas, AR-15","description":"\u003cp\u003eThis Ballistic Advantage 18-inch SPR profile barrel is built for precision work at extended ranges with 5.56 NATO and .223 Remington chamberings. The Special Purpose Rifle (SPR) profile provides a balance of rigidity and weight management, making it well-suited for designated marksman setups, long-range target shooting, and varmint hunting where accurate fire beyond typical carbine distances is required. The Ops 12 designation indicates a rifle-length gas system that reduces felt recoil and improves cycling reliability with a wide range of ammunition weights.\u003c\/p\u003e\u003cp\u003eThe barrel features a .750-inch gas block journal and is threaded 1\/2x28 TPI for standard AR-15 muzzle devices. Constructed from 4150 Chrome Moly Vanadium steel with a black nitride finish for corrosion resistance and extended barrel life. The 1:8 twist rate stabilizes bullets from 55 to 77 grains effectively. Direct drop-in compatibility with mil-spec AR-15 upper receivers. Headspaced and test-fired at the factory.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e AR-15 Barrel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCaliber:\u003c\/strong\u003e 5.56 NATO \/ .223 Remington\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 18 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProfile:\u003c\/strong\u003e SPR (Special Purpose Rifle)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGas System:\u003c\/strong\u003e Rifle-length (Ops 12)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwist Rate:\u003c\/strong\u003e 1:8\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e 4150 Chrome Moly Vanadium Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Black Nitride\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Pitch:\u003c\/strong\u003e 1\/2x28 TPI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGas Block Journal:\u003c\/strong\u003e .750 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Firearms:\u003c\/strong\u003e AR-15 platform rifles (mil-spec upper receivers)\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Ballistic Advantage","offers":[{"title":"Default Title","offer_id":47941756518655,"sku":"BABL556020M","price":175.75,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/0434\/3807\/files\/1242396.jpg?v=1766569673","url":"https:\/\/doublestackstore.com\/products\/ballistic-bbl-5-56-18-spr-ops12-pro","provider":"Double Stack Store","version":"1.0","type":"link"}