{"product_id":"cmmg-resolute-mk4-300-blackout-16-1-complete-upper-group-black","title":"CMMG Resolute MK4 .300 Blackout 16.1\" Complete Upper Group - Black","description":"\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThe \u003cstrong\u003e\u003cspan style=\"background-color: #ffff00;\"\u003eCMMG Resolute MK4\u003c\/span\u003e\u003c\/strong\u003e complete upper group brings CMMG's proven \u003cstrong\u003eMk4\u003c\/strong\u003e AR-15 platform to \u003cstrong\u003e.300 Blackout\u003c\/strong\u003e shooters, delivering a turn-key assembly that mates to any mil-spec lower receiver. Purpose-built around the strengths of the \u003cstrong\u003e.300 BLK\u003c\/strong\u003e cartridge, this upper supports both subsonic and supersonic loadings from a single barrel, making it a versatile choice for suppressed home-defense setups and general range work alike.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eAt the core of the build is a \u003cstrong\u003e16.1-inch\u003c\/strong\u003e barrel with a \u003cstrong\u003e1:7\u003c\/strong\u003e twist rate, a configuration well-suited to stabilizing the wide range of bullet weights used in .300 Blackout. The upper receiver is machined from \u003cstrong\u003ebillet 6061 T6 aluminum\u003c\/strong\u003e and finished in CMMG's standard \u003cstrong\u003eblack Cerakote\u003c\/strong\u003e for corrosion and wear resistance. CMMG's \u003cstrong\u003eEML15 M-LOK\u003c\/strong\u003e handguard wraps the barrel, providing a slim, lightweight platform for mounting accessories, while a \u003cstrong\u003eZEROED\u003c\/strong\u003e charging handle rounds out the controls.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThis upper ships ready to mount on any standard AR-15 lower, with an overall assembly length of approximately \u003cstrong\u003e25 inches\u003c\/strong\u003e and a weight near \u003cstrong\u003e4.1 lbs\u003c\/strong\u003e. Whether the goal is a quiet, suppressed .300 BLK rifle for home defense or a supersonic hunting and range platform, the Resolute MK4 upper provides a durable, optics-ready foundation.\u003c\/span\u003e\u003c\/p\u003e","brand":"CMMG","offers":[{"title":"Default Title","offer_id":55292684534082,"sku":"30B12BBAB","price":839.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0997\/7921\/5682\/files\/alt_5a8e9bef-dee8-4a00-ba83-f82d84b6d4b7.jpg?v=1785103221","url":"https:\/\/centerfiresystems.com\/products\/cmmg-resolute-mk4-300-blackout-16-1-complete-upper-group-black","provider":"Centerfire Systems","version":"1.0","type":"link"}