Home / AR Parts / Primary Weapon Systems / PWS AR-15 MK109 MOD 1-M Complete Upper Receiver 300 Blackout 9.75" Barrel Long Stroke Piston
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Primary Weapon Systems MK109 Mod 1-M 300 Blackout 9.75" Complete Upper Receiver
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9.75 300BLK Barrel"
Barrel Twist Rate 1:8
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PWS Triad 30 Muzzle Device
Radian Raptor
Radian Raptor Ambidextrous Charging Handle
Specifications
Caliber
Brand
Model
MK109
MPN
MK1-M1U-300BLK-9
UPC
811154033451
MSRP
$1,299
Action
Semi-Auto
Barrel Length
9.75"
Finish
Anodized
Fits
AR-15
Description
The Primary Weapon Systems MK109 Mod 1-M is a complete AR-15 upper receiver chambered in 300 Blackout. It uses a long-stroke piston system and is built around a 9.75-inch barrel, making it a compact option for shooters who want a short, suppressor-compatible setup.
The upper is finished in black anodized aluminum with a threaded barrel and a free-float M-LOK handguard. Forward assist controls are included. Both upper and lower receivers are described as fully forged.
It is designed to fit AR-15 platform lowers.
- Brand: Primary Weapon Systems
- Model: MK109 Mod 1-M
- Caliber: 300 Blackout
- Barrel Length: 9.75 inches
- Action: Semi-Auto
- Finish: Black anodized
- Threaded Barrel: Yes
- Fits: AR-15
