- Fits Mil-Spec AR-15 Lowers
- PWS Long Stroke Piston System
- 9.75-inch FNC-HD Nitrided Barrel, 1:8 Twist
- 3-Position Adjustable Gas Regulator, Suppressor-Ready
- 6.9-inch Free-Float M-LOK Handguard
- Includes BCG, Radian Raptor Charging Handle, and PWS Triad 30
- Color: Black
- Caliber: .300 Blackout
- MPN: MK1-M1U-300BLK-9
The PWS MK109 Mod 1-M is a complete piston-driven upper receiver for AR-15 pattern lowers chambered in .300 Blackout. The 9.75-inch FNC-HD nitrided barrel features a 1:8 twist and pistol-length gas system, optimized for reliable cycling with both supersonic and subsonic ammunition — suppressed or unsuppressed. The PWS Long Stroke Piston system with 3-position adjustable gas regulator keeps carbon fouling out of the action. The 6.9-inch free-float M-LOK handguard keeps the package compact, and the Radian Raptor ambidextrous charging handle and PWS Triad 30 muzzle device are included. Ships with bolt carrier group.
