Primary Weapons Systems
PWS MK1 Mod 1-M .300 BLK Assembled Upper Receiver - 9.75" Barrel
- SKU:
- M109UB01-1F
- UPC:
- 811154033451
- MPN:
- MK1-M1U-300BLK-9
- Availability:
- In Stock If You Can Add To Cart!
- Shipping:
- Calculated at Checkout
Description
PWS MK1 Mod 1-M .300 BLK Assembled Upper Receiver - 9.75" Barrel
The Primary Weapons Systems MK109 MOD 1-M Upper is the embodiment of versatility, reliability, and tactical precision. Chambered in 300 BLK, this compact powerhouse is optimized for both super and subsonic ammunition, making it a top choice for law enforcement, heli-hunters, and civilian shooters alike. With a 9" barrel crafted from premium 41V50 steel, the MK109 delivers exceptional durability and accuracy in a maneuverable platform.
At the heart of the MK109 is the legendary PWS Long-Stroke Piston System, engineered for cleaner operation, reduced fouling, and enhanced reliability—especially when suppressed. The 3-position adjustable gas system allows shooters to fine-tune performance across environments and ammo types. Fully forged 7075-T651 aluminum receivers, a free-float MLOK handguard, and a Radian Raptor™ ambidextrous charging handle round out a feature-rich build designed to perform under pressure.
Whether you're running suppressed or unsuppressed, in close quarters or open terrain, the MK109 MOD 1-M is the “ideal rifle” for those who demand uncompromising performance in a compact form.
Sub-MOA Accuracy Guarantee
Precision barrels deliver consistent sub-MOA groups with high-grade ammunition.
PWS Long-Stroke Piston System
Cleaner, cooler, and more reliable than DI systems—perfect for suppressed use.
Adjustable Gas System
3-position settings for tuning performance with different loads and suppressors.
Suppressor Optimized
Minimizes backpressure and gas blowback for a cleaner, more comfortable shooting experience.
9" 300 BLK Barrel
Made from 41V50 steel with a 1:6 twist rate for superior accuracy with super and subsonic rounds.
Fully Forged Receivers
7075-T651 aluminum upper and lower for unmatched strength and mil-spec compatibility.
Free-Float MLOK Handguard
Lightweight and modular for accessory mounting and improved handling.
PWS FRC 2-Port Compensator
Suppressor-compatible and designed to reduce recoil and muzzle rise.
Forward Assist Integration
Enhances reliability in adverse conditions with positive chambering.
Radian Raptor™ Charging Handle
Ambidextrous design for smooth operation from either side.
PWS VOW Warranty
Full coverage for defects and performance issues—your satisfaction guaranteed.
Specifications
- Caliber: 300 BLK
- Barrel Length: 9"
- Barrel Material: 41V50 steel
- Twist Rate: 1:6
- Muzzle Device: PWS FRC 2-Port Compensator (Rearden Atlas compatible)
- Gas System: PWS Long-Stroke Piston, 3-position adjustable
- Receiver Material: Forged 7075-T651 aluminum
- Handguard: Free-float MLOK
- Charging Handle: Radian Raptor™ ambidextrous
- Forward Assist: Integrated
- Weight (Upper): 3.5 lbs
- Accuracy: Sub-MOA guarantee with match-grade ammo
- Suppressor Compatibility: Optimized for reduced blowback and cleaner cycling
- Warranty: PWS VOW – repair or replacement for any defects
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