Buy MK109 MOD 2-M Upper .300BLK

Discover the PWS MK109 MOD 2-M Upper .300BLK — a premium complete upper receiver assembly engineered for superior reliability and performance in .300 Blackout. Built with Primary Weapons Systems’ acclaimed , this upper delivers cleaner running, reduced recoil, and unmatched dependability compared to traditional direct impingement uppers.

Designed to pair perfectly with MOD 2-M lowers, the MK109 MOD 2-M features a compact 9″ barrel (pinned & welded or standard configurations), full M-LOK handguard, and modern ambidextrous-ready design. Ideal for building a short, quiet, and highly effective .300BLK rifle or SBR for home defense, suppressed shooting, or tactical applications.

Key Features & Benefits

• Long-Stroke Piston System: Exceptional reliability with minimal carbon fouling and gas blowback. Includes a 3-position adjustable gas regulator optimized for suppressed and unsuppressed use.
• .300 Blackout Chamber: Optimized for both supersonic and subsonic .300BLK ammunition, making it an excellent choice for suppressed shooting with subsonic loads.
• 9″ Barrel Option: Precision barrel with 1:8 twist rate for excellent accuracy and terminal performance in a compact package (overall length typically pinned to 10.5″ or 16″ depending on configuration).
• MOD 2-M Compatible Forged Upper: Lightweight forged 7075-T6 aluminum upper with enhanced ergonomics and no forward assist for modern aesthetics and reduced weight.
• Extended M-LOK Handguard: Slim, free-floating handguard provides maximum accessory mounting flexibility while maintaining excellent heat dissipation.
• Suppressor Optimized: Low back-pressure design and adjustable gas system make it one of the best .300BLK uppers for running suppressors quietly and reliably.
• Premium Components: Includes PWS FSC or Triad muzzle device, Radian Raptor compatible charging handle cutouts, and enhanced bolt carrier group.

Why Choose the PWS MK109 MOD 2-M .300BLK Upper?

This upper stands out for its piston-driven reliability in the .300 Blackout caliber. Whether you’re building a compact SBR, a pistol, or a standard rifle, the MK109 MOD 2-M delivers soft shooting, minimal maintenance, and sub-MOA accuracy potential with quality ammunition. Manufactured in the USA, it’s the perfect upgrade for shooters who want a cleaner, more reliable .300BLK platform.

Technical Specifications

• Caliber: .300 Blackout (.300 BLK)
• Barrel Length: 9″ (commonly pinned & welded)
• Barrel Twist: 1:8
• Gas System: Short-Stroke / Mid-Length Long-Stroke Piston with 3-Position Adjustable Regulator
• Handguard: Extended M-LOK Free-Float
• Upper Receiver: Forged 7075-T6 MK109 MOD 2-M
• Operating System: PWS Long-Stroke Piston
• Finish: Hardcoat Anodized Black
• Compatibility: Designed for MK1 MOD 2-M lowers

Build your ultimate .300BLK setup today. Add the PWS MK109 MOD 2-M Upper .300BLK to your cart for premium piston performance.