{"product_id":"cmmg-30df80a-barrel-sub-assembly-300-blackout-16-1-1-7-4140-chromoly-black-nitride-ar-15","title":"CMMG 30DF80A Barrel Sub-Assembly 300 Blackout 16.1\" 1:7 4140 Chromoly Black Nitride AR-15","description":"\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThe \u003cstrong\u003e\u003cspan style=\"background-color: #ffff00;\"\u003eCMMG 30DF80A Barrel Sub-Assembly\u003c\/span\u003e\u003c\/strong\u003e is purpose-built for assembling a custom \u003cstrong\u003eAR-15\u003c\/strong\u003e upper chambered in \u003cstrong\u003e\u003cspan style=\"background-color: #ffff00;\"\u003e300 Blackout\u003c\/span\u003e\u003c\/strong\u003e (also known as .300 AAC Blackout \/ 7.62x35mm). Cut from \u003cstrong\u003e4140 Chromoly steel\u003c\/strong\u003e and finished in a tough \u003cstrong\u003eBlack Nitride\u003c\/strong\u003e coating, this \u003cstrong\u003e16.1\"\u003c\/strong\u003e barrel uses CMMG's versatile \u003cstrong\u003eMulti Role (MR) profile\u003c\/strong\u003e to balance heat dissipation and carry weight for general-purpose carbine use. A \u003cstrong\u003e1:7\"\u003c\/strong\u003e twist stabilizes the broad spread of supersonic and subsonic projectiles that make 300 BLK such a flexible round for both suppressed and unsuppressed shooting.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThis sub-assembly ships ready to install. Each CMMG barrel comes with a properly fitted \u003cstrong\u003eM4 barrel extension\u003c\/strong\u003e already installed and is \u003cstrong\u003eheadspaced\u003c\/strong\u003e at the factory, so the builder only needs to pin it to a compatible upper receiver and complete the build with a gas system, handguard, bolt carrier group, and muzzle device. The gas port is positioned for a standard \u003cstrong\u003ecarbine-length\u003c\/strong\u003e gas system, supporting reliable cycling across a wide variety of \u003cstrong\u003e300 AAC Blackout\u003c\/strong\u003e loads, while the Nitride finish helps both the bore and exterior resist wear and corrosion during extended range use.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003e\u003cstrong\u003eSights:\u003c\/strong\u003e none installed, leaving the build clean for the shooter's preferred optic or iron-sight setup. This listing is for the barrel sub-assembly only; the upper receiver, handguard, bolt carrier group, gas tube, and muzzle device are sold separately.\u003c\/span\u003e\u003c\/p\u003e","brand":"CMMG","offers":[{"title":"Default Title","offer_id":54990793703746,"sku":"3189","price":189.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0997\/7921\/5682\/files\/hires_90a0dd5f-2dfb-4ce0-8119-d9191b7cbae8.png?v=1784186524","url":"https:\/\/centerfiresystems.com\/products\/cmmg-30df80a-barrel-sub-assembly-300-blackout-16-1-1-7-4140-chromoly-black-nitride-ar-15","provider":"Centerfire Systems","version":"1.0","type":"link"}