Buy MK109 MOD 1-M Upper .300 BLK
$1,209.00
The MK109 MOD 1-M Pistol is equipped with the renowned PWS PWS long-stroke piston system, maintaining the reliability that PWS owners have come to trust. This line features a free-float MLOK handguard, forward assist controls, and a design closer to mil-spec standards, catering to civilians and Law Enforcement alike. With fully forged upper and lower receivers, the MK1 MOD 1-M offers a straightforward solution for those seeking a high-value option that delivers unwavering performance in any situation.
What PWS aficionados refer to as the “ideal rifle”, the MK109 MOD 1-M is perfect for shooters looking for a weapon with endless uses. Maintaining the shortest barrel length recommended for suppressed use, this compact rifle is one of the most popular from LE to heli-hunting.
Discover the PWS MK109 MOD 1-M Upper .300 BLK — a rugged and reliable complete upper receiver built for shooters who prefer the classic Mod 1-M platform with modern piston performance.
Chambered in .300 Blackout, this upper features a 9″ barrel and Primary Weapons Systems’ proven long-stroke piston operating system. It delivers cleaner running, significantly reduced fouling, softer recoil, and superior reliability compared to standard direct impingement uppers. The traditional Mod 1-M forged design with forward assist makes this upper ideal for those who want a no-nonsense, mil-spec feel in a compact .300 BLK package.
Perfect for building a short .300 BLK pistol, SBR, or compact suppressed rifle for home defense, tactical use, or hunting.
Key Features & Benefits
- Long-Stroke Piston System: Exceptional reliability with minimal carbon buildup and gas blowback. Includes a 3-position adjustable gas regulator for optimized suppressed and unsuppressed performance.
- 9″ .300 Blackout Barrel: Precision barrel with 1:8 twist rate, optimized for both supersonic and subsonic .300 BLK ammunition.
- Mod 1-M Forged Design: Traditional forged 7075-T6 aluminum upper with forward assist for proven durability and classic AR familiarity.
- 9.05″ M-LOK Handguard: Slim, free-floating design offers excellent accessory mounting options while maintaining rigidity and heat dissipation.
- Suppressor Optimized: Low back-pressure piston system makes it one of the best hosts for .300 BLK suppressors, especially with subsonic ammo.
- Premium Components: Enhanced PWS bolt carrier group, Radian Raptor compatible charging handle cut, and threaded muzzle (5/8×24) ready for your choice of muzzle device or suppressor mount.
- Ambidextrous Ready: Fully compatible with both standard and MOD 2-M ambidextrous lowers.
Why Choose the PWS MK109 MOD 1-M .300 BLK Upper?
The MK109 MOD 1-M combines the trusted Mod 1-M platform with PWS’s legendary piston system, giving you a hard-hitting, quiet, and extremely reliable .300 Blackout upper. It excels in close-quarters applications and suppressed shooting while offering easier maintenance and better durability than traditional gas-impingement uppers. Manufactured in the USA, this upper is a top choice for serious .300 BLK builders.
Technical Specifications
- Caliber: .300 Blackout (.300 BLK)
- Barrel Length: 9″ with 1:8 Twist
- Gas System: Short-Length Long-Stroke Piston with 3-Position Adjustable Regulator
- Handguard: 9.05″ Free-Float M-LOK
- Upper Receiver: Forged 7075-T6 Mod 1-M with Forward Assist
- Muzzle Threads: 5/8×24
- Finish: Hardcoat Anodized Black
- Compatibility: Works with standard AR-15 and MOD 2-M lowers
Build your ideal .300 BLK pistol or SBR today. Add the PWS MK109 MOD 1-M Upper .300 BLK to your cart for premium piston performance.
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