PWS MK116 MOD 1-M Complete Upper Receiver 5.56 NATO – AR-15 Platform

The PWS MK116 MOD 1-M is a complete 16.1-inch upper receiver chambered in 5.56 NATO, designed for direct installation on any mil-spec AR-15 lower receiver. This upper features the company's long-stroke piston system, which reduces fouling and heat transfer to the bolt carrier group compared to direct impingement systems. The MOD 1-M configuration includes a free-float M-LOK rail for accessory mounting and weight reduction.

Built with a 4150 chrome moly vanadium steel barrel and finished in black, this upper comes fully assembled with bolt carrier group and charging handle. The long-stroke piston design requires no modification to standard AR-15 lowers and uses a proprietary FSC muzzle device. Installation requires no gunsmithing—simply pin to a mil-spec lower and perform a function check before use.

• Caliber: 5.56 NATO
• Type: Complete upper with BCG and charging handle
• Compatible Lower: Mil-spec AR-15
• Barrel Length: 16.1 inches
• Material: 4150 CMV steel barrel
• Finish: Black
• Includes: Bolt carrier group, charging handle, FSC muzzle device
• Gas System: Long-stroke piston