Pws Mk1 Mod 2-M Upper 300Blk 9.75 Ls Frc Comp

The Primary Weapons Systems MK1 Mod 2-M upper receiver in 300 Blackout is a purpose-built complete upper for shooters who demand precision engineering in a compact platform. This is a long-stroke piston upper—PWS's proven system—paired with a 9.75-inch barrel and designed around 300 BLK's subsonic performance envelope. At 1:8 twist and delivering 2216 fps out of the gate, it's built for both suppressed fire and standard velocity rounds. The forged T6 7075 aluminum upper and lower receivers are anodized for durability, and the attention to detail—flared magazine well, integrated trigger guard, and no forward assist—reflects the high-end craftsmanship PWS is known for.

The MK1 Mod 2-M stands out through intelligent feature choices. The proprietary PWS Triad 30 muzzle device is included, and the 8.9-inch handguard uses PWS's patent-pending PicLok technology, letting you run either Picatinny or M-LOK accessories without adapters. The Radian Raptor ambidextrous charging handle comes already installed, so you're ready to run from the moment you mount this upper on a compatible lower receiver. It's a compact, no-nonsense upper that works equally well for suppressed 300 BLK builds, short-range hunting, or tactical applications where barrel length and maneuverability matter.

If you're building a 300 Blackout short-barrel rifle and want a complete upper that doesn't cut corners on finish or function, this MK1 Mod 2-M delivers. The long-stroke piston system is known for reliability and smooth operation, and the design is inherently modular—swap lower receivers as your mission changes. This is gear built for people who understand that a quality upper is the foundation of a dependable rifle.

Key Features

• Complete forged upper receiver assembly, ready to mate with any compatible lower
• 9.75-inch 300 Blackout barrel with 1:8 twist for subsonic and standard-velocity rounds
• PWS long-stroke piston system for reliable, low-maintenance operation
• Patent-pending PicLok handguard accepts both Picatinny and M-LOK accessories
• PWS Triad 30 muzzle device included
• Radian Raptor ambidextrous charging handle
• Flared magazine well and integrated trigger guard for ergonomic control
• No forward assist—streamlined profile for compact configurations
• Anodized T6 7075 aluminum construction

Specifications

Frequently Asked Questions

What lower receiver does this upper fit?

This is a complete upper receiver assembly. It is compatible with any standard mil-spec lower receiver chambered in 300 Blackout. The upper receiver itself is made by PWS, and the flared magazine well and integrated trigger guard are built into the design.

Is this upper suitable for a short-barrel rifle (SBR) or suppressed setup?

Yes. The 9.75-inch barrel and 1:8 twist rate are engineered for 300 Blackout performance, including subsonic ammunition and suppressed fire. The compact profile and long-stroke piston system make this a natural choice for SBR builds and tactical configurations.

What's included with this upper?

The complete upper receiver assembly comes with the PWS Triad 30 muzzle device and a Radian Raptor ambidextrous charging handle already installed. The 8.9-inch PicLok handguard is integrated. You will need to mount it on a compatible lower receiver to complete your rifle.

What is PicLok, and why does it matter?

PicLok is PWS's proprietary mounting system on the handguard. It allows you to attach either Picatinny or M-LOK accessories without adapters, giving you flexibility in how you configure your rails and attachments.