{"product_id":"cmmg-upper-receiver-assembly-mk4-ar-15-tungsten-cerakote-stripped-upper","title":"CMMG Upper Receiver Assembly Mk4\/AR-15 Tungsten Cerakote Stripped Upper","description":"\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eDrop the \u003cstrong\u003e\u003cspan style=\"background-color: #ffff00;\"\u003eCMMG Upper Receiver Assembly Mk4\/AR-15\u003c\/span\u003e\u003c\/strong\u003e onto any mil-spec AR-15 lower and you have the foundation for a complete rifle or pistol-caliber build. Machined from \u003cstrong\u003eforged 7075-T6 aluminum\u003c\/strong\u003e and finished in a low-glare \u003cstrong\u003eTungsten Cerakote\u003c\/strong\u003e, this stripped upper ships with the factory-installed \u003cstrong\u003eforward assist\u003c\/strong\u003e and \u003cstrong\u003eejection port door assembly\u003c\/strong\u003e, so it arrives ready to be paired with the barrel, bolt carrier group, and charging handle of your choice.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThe Mk4 receiver carries an \u003cstrong\u003eenlarged ejection port\u003c\/strong\u003e sized to clear the taller case heads of common pistol-caliber AR-15 builds in \u003cstrong\u003e9mm Luger\u003c\/strong\u003e, \u003cstrong\u003e10mm\u003c\/strong\u003e, \u003cstrong\u003e.40 S\u0026amp;W\u003c\/strong\u003e, and \u003cstrong\u003e.45 ACP\u003c\/strong\u003e, in addition to standard \u003cstrong\u003e5.56x45mm NATO\u003c\/strong\u003e rifle setups. That extra clearance makes the same upper a versatile foundation for a 5.56 NATO duty rifle or a pistol-caliber carbine without swapping uppers. The standard AR-15 Picatinny rail on top accepts any optic, iron sight, or magnifier mount, and the upper's external geometry matches mil-spec handguards for free-float or drop-in fitment.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eBuilt to CMMG's \u003cstrong\u003eMk4 \/ AR-15 specification\u003c\/strong\u003e, this Tungsten upper is offered here as the \u003cstrong\u003estripped upper receiver assembly only\u003c\/strong\u003e. \u003cstrong\u003eNo barrel, bolt, bolt carrier, charging handle, handguard, muzzle device, lower receiver, or sights are included\u003c\/strong\u003e.\u003c\/span\u003e\u003c\/p\u003e","brand":"CMMG","offers":[{"title":"Default Title","offer_id":55292714647874,"sku":"55BA290TNG","price":125.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0997\/7921\/5682\/files\/alt_5f533380-8926-4f81-a285-13def98f30f9.jpg?v=1785103260","url":"https:\/\/centerfiresystems.com\/products\/cmmg-upper-receiver-assembly-mk4-ar-15-tungsten-cerakote-stripped-upper","provider":"Centerfire Systems","version":"1.0","type":"link"}