{"product_id":"primary-weapons-mk114-mod-2-m-6mm-arc-14-5-piston-ar-15-complete-upper","title":"Primary Weapons MK114 MOD 2-M 6mm ARC 14.5\" Piston AR-15 Complete Upper","description":"\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThe \u003cstrong\u003e\u003cspan style=\"background-color: #ffff00;\"\u003ePrimary Weapons MK114 MOD 2-M\u003c\/span\u003e\u003c\/strong\u003e is a complete \u003cstrong\u003eAR-15 upper receiver\u003c\/strong\u003e assembly chambered in \u003cstrong\u003e6mm ARC\u003c\/strong\u003e and built around PWS's long-stroke \u003cstrong\u003episton operating system\u003c\/strong\u003e. Purpose-built for long-range performance, this upper delivers flat trajectories and reduced recoil while retaining the familiar AR-15 manual of arms.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eAt the heart of the upper is a \u003cstrong\u003e14.5\" barrel\u003c\/strong\u003e paired with PWS's proven long-stroke piston drive, which routes propellant gases through a dedicated piston and rod rather than the traditional direct-impingement tube. The piston system is widely regarded for its \u003cstrong\u003ereliability\u003c\/strong\u003e in adverse conditions and its ability to \u003cstrong\u003ereduce fouling\u003c\/strong\u003e reaching the bolt carrier group, keeping the action running cleaner over extended shooting sessions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThe MK114 MOD 2-M upper features a \u003cstrong\u003elightweight forged\u003c\/strong\u003e build engineered to produce a maneuverable, well-balanced package well-suited to long-range precision work without sacrificing handling. It drops onto any standard \u003cstrong\u003eAR-15 lower receiver\u003c\/strong\u003e, making it a straightforward upgrade or platform builder for shooters looking to expand into the 6mm ARC cartridge.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThe \u003cstrong\u003e6mm ARC\u003c\/strong\u003e chambering is highlighted by \u003cstrong\u003eflat trajectories\u003c\/strong\u003e and \u003cstrong\u003ereduced recoil\u003c\/strong\u003e, making it well-suited to long-range precision applications while maintaining the handling characteristics of the AR-15 platform.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThis listing is for the \u003cstrong\u003ecomplete upper receiver assembly\u003c\/strong\u003e only, including the barrel, gas system, handguard, and upper receiver housing. A lower receiver is required for function and is \u003cstrong\u003enot included\u003c\/strong\u003e.\u003c\/span\u003e\u003c\/p\u003e","brand":"Primary Weapons","offers":[{"title":"Default Title","offer_id":55077242274114,"sku":"195779","price":1377.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0997\/7921\/5682\/files\/hires_b2ca5115-f487-42f6-b685-1972ce298905.png?v=1784757385","url":"https:\/\/centerfiresystems.com\/products\/primary-weapons-mk114-mod-2-m-6mm-arc-14-5-piston-ar-15-complete-upper","provider":"Centerfire Systems","version":"1.0","type":"link"}