{"product_id":"primary-weapons-mk109-mod-2-m-300-blackout-9-75-ar-15-piston-upper","title":"Primary Weapons MK109 MOD 2-M .300 Blackout 9.75\" AR-15 Piston Upper","description":"\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThe \u003cstrong\u003e\u003cspan style=\"background-color: #ffff00;\"\u003ePrimary Weapons Systems MK109 MOD 2-M\u003c\/span\u003e\u003c\/strong\u003e is a purpose-built \u003cstrong\u003e.300 Blackout\u003c\/strong\u003e complete upper receiver assembly engineered around PWS's signature \u003cstrong\u003elong-stroke piston\u003c\/strong\u003e operating system. Designed to drop onto any standard \u003cstrong\u003eAR-15\u003c\/strong\u003e lower receiver, it gives the shooter a compact, dependable \u003cstrong\u003e300 BLK\u003c\/strong\u003e platform for home defense, hunting, and range use.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eAt the heart of the MK109 MOD 2-M is a \u003cstrong\u003e9.75\" barrel\u003c\/strong\u003e chambered in \u003cstrong\u003e.300 AAC Blackout\u003c\/strong\u003e, stabilized by a \u003cstrong\u003e1:8\u003c\/strong\u003e twist rate that handles everything from lightweight supersonic projectiles to heavier subsonic loads. PWS's \u003cstrong\u003elong-stroke piston\u003c\/strong\u003e drive routes propellant gas through a self-contained operating rod rather than bleeding it directly into the bolt carrier group, which significantly reduces fouling and heat soak and keeps the action running cleaner over extended sessions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eA \u003cstrong\u003e3-setting adjustable gas regulator\u003c\/strong\u003e lets the shooter tune the system for unsuppressed fire, suppressed fire with subsonic ammo, or a neutral middle setting, making this upper especially well suited to a short-barrel suppressed \u003cstrong\u003e300 BLK\u003c\/strong\u003e build. The upper receiver is \u003cstrong\u003esurface-machined from forged aluminum\u003c\/strong\u003e and is built \u003cstrong\u003ewithout a forward assist\u003c\/strong\u003e, trimming weight and cleaning up the right side of the receiver.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eOut front, an \u003cstrong\u003e8.9\" PWS PicLok handguard\u003c\/strong\u003e with full \u003cstrong\u003eMLOK\u003c\/strong\u003e slots provides a slim, rigid mounting platform for lights, lasers, foregrips, and bipods. The muzzle is finished with the \u003cstrong\u003ePWS Triad muzzle device\u003c\/strong\u003e, designed to reduce flash and help control recoil on a short-barrel package.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003e\u003cstrong\u003eUpper receiver assembly only. AR-15 lower receiver and BCG sold separately.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"Primary Weapons","offers":[{"title":"Default Title","offer_id":55077183291714,"sku":"195778","price":1377.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0997\/7921\/5682\/files\/hires_2b7d83b4-500b-4571-89b7-db23d3dc44ea.png?v=1784757333","url":"https:\/\/centerfiresystems.com\/products\/primary-weapons-mk109-mod-2-m-300-blackout-9-75-ar-15-piston-upper","provider":"Centerfire Systems","version":"1.0","type":"link"}