{"product_id":"cmmg-30d120a-barrel-sub-assembly-300-blackout-16-10-1-7-black-nitride-ar-15","title":"CMMG 30D120A Barrel Sub-Assembly 300 Blackout 16.10\" 1:7 Black Nitride AR-15","description":"\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThe \u003cstrong\u003e\u003cspan style=\"background-color: #ffff00;\"\u003eCMMG 30D120A Barrel Sub-Assembly\u003c\/span\u003e\u003c\/strong\u003e is a purpose-built \u003cstrong\u003e16.10\"\u003c\/strong\u003e replacement barrel for the \u003cstrong\u003eAR-15\u003c\/strong\u003e platform, chambered in \u003cstrong\u003e\u003cspan style=\"background-color: #ffff00;\"\u003e300 AAC Blackout\u003c\/span\u003e\u003c\/strong\u003e (7.62x35mm). Designed to drop into a custom upper build, every CMMG Barrel Sub-Assembly is properly headspaced and ships with an installed M4 barrel extension, saving time at the bench and getting your upper into service faster.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eCut from \u003cstrong\u003e4140 Chromoly Steel\u003c\/strong\u003e and treated with a durable \u003cstrong\u003e\u003cspan style=\"background-color: #ffff00;\"\u003eBlack Nitride\u003c\/span\u003e\u003c\/strong\u003e (Salt Bath Nitride) finish, the barrel's surface is hardened for improved wear resistance and corrosion protection in the field. A \u003cstrong\u003e1:7\" rifling twist\u003c\/strong\u003e is well-matched to the wide range of supersonic and subsonic bullet weights used in 300 Blackout, and the \u003cstrong\u003eMedium Taper Profile\u003c\/strong\u003e keeps weight manageable without sacrificing accuracy. Sized as a \u003cstrong\u003eCarbine Length\u003c\/strong\u003e barrel at \u003cstrong\u003e16.10\"\u003c\/strong\u003e, this barrel pairs cleanly with a standard mil-spec carbine gas system for a reliable cycling AR-15 upper.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eNo iron sights are installed, leaving the top of the barrel free for the handguard and sighting system of your choice. Pair it with the upper receiver parts of your choosing to assemble a quiet, suppressed subsonic 300 BLK build, a heavy-bullet hunting rig, or any AR-15 upper you want to tailor around the versatile 300 Blackout cartridge.\u003c\/span\u003e\u003c\/p\u003e","brand":"CMMG","offers":[{"title":"Default Title","offer_id":54990764015938,"sku":"3190","price":189.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0997\/7921\/5682\/files\/hires_1e14368f-6f7c-4ce4-946f-354835c4c632.png?v=1784186386","url":"https:\/\/centerfiresystems.com\/products\/cmmg-30d120a-barrel-sub-assembly-300-blackout-16-10-1-7-black-nitride-ar-15","provider":"Centerfire Systems","version":"1.0","type":"link"}