Primary Weapons Systems MK1 Mod2-M Upper 223 Wylde
Primary Weapons Systems MK1 Mod2-M upper receiver with 11.85" barrel, long-stroke piston system, and innovative PicLok handguard supporting both Picatinny and M-Lok accessories.
Primary Weapons Systems MK1 Mod2-M Upper Receiver
The MK1 Mod2-M represents a thoughtful evolution in AR-15 upper receiver design, built around Primary Weapons Systems' proven long-stroke piston operating system. This is a serious tool for shooters who demand reliability and flexibility.
Key Features
- 223 Wylde Chamber: Accepts both 5.56 NATO and .223 Remington ammunition with optimal accuracy
- 11.85" Barrel: Provides excellent velocity and handling characteristics for tactical and sporting applications
- PicLok Handguard Technology: The 11" free-float handguard features patent-pending PicLok mounting, allowing you to attach either Picatinny or M-Lok accessories without tools or adapters
- Long-Stroke Piston System: Proven reliability with softer recoil impulse compared to direct impingement designs
- Radian Raptor Charging Handle: Smooth, ambidextrous operation
- 7075-T6 Aluminum Construction: Lightweight yet durable receiver material
- Optics Ready: Flat-top design accepts any standard AR-15 optic mount
Design Philosophy
The MK1 Mod2-M eliminates the guesswork from accessory mounting. Whether you prefer Picatinny rails or M-Lok slots, this upper adapts to your setup without compromise. The free-float handguard ensures consistent accuracy by isolating the barrel from external pressure.
This is a complete upper receiver—simply pair it with your lower receiver and you're ready to shoot.
