Pws Mk111 Mod 2-M Upper 338Arc 11.85 Ls Frc

The Primary Weapons Systems Mk111 Mod 2-M upper receiver in 338 ARC combines the modular versatility PWS is known for with a modern intermediate cartridge built for serious shooters. This 338 ARC upper features an 11.85-inch barrel and comes equipped with PWS's reliable free-float rail system, giving you a capable mid-range setup that handles hunting, tactical use, and precision shooting without unnecessary bulk. Whether you're building a short-range hunting rifle or a compact precision platform, the Mk111 Mod 2-M delivers the accuracy and durability PWS customers expect.

PWS uppers are engineered to Mil-Spec standards and work seamlessly with standard AR-15 compatible lower receivers. The 338 ARC cartridge sits between 223 Remington and 308 Winchester in terms of power and velocity, making it an excellent choice for medium-range hunting and target shooting. The free-float rail isolates the barrel from the receiver to maximize consistency shot-to-shot, and the 11.85-inch configuration keeps your overall package compact while maintaining effective ballistics at practical distances.

This is a quality upper receiver assembly from a manufacturer that knows modern rifle systems inside and out. If you run a mil-spec lower or are planning to complete a new build, the Mk111 Mod 2-M in 338 ARC is a straightforward path to a specialized, accurate rifle.

Key Features

• 338 ARC chamber — efficient intermediate cartridge optimized for medium-range shooting and hunting
• 11.85-inch barrel — compact length without sacrificing velocity or accuracy
• Free-float rail system — improves consistency by isolating the barrel from the upper receiver
• Mk111 Mod 2-M platform — modular, mil-spec design compatible with standard AR-15 lowers
• Upper receiver assembly — ready to pair with a compatible 338 ARC-chambered bolt carrier group and lower receiver

Specifications

Frequently Asked Questions

What lower receiver is compatible with the Pws Mk111 Mod 2-M upper?

This upper is a standard Mil-Spec AR-15 design and will work with any mil-spec AR-15 compatible lower receiver. Simply ensure your lower is in 338 ARC if you want this upper to function correctly, or pair it with a multi-caliber lower and swap uppers as needed.

Is the Mk111 Mod 2-M upper suitable for hunting?

Yes. The 338 ARC cartridge is designed for medium-range hunting applications, and the 11.85-inch barrel provides effective velocity for game at practical distances. Pair it with quality ammunition and optics suited to your expected range, and you have a capable hunting setup.

What's included with this upper receiver?

This is an upper receiver assembly. To complete a functional rifle, you'll need a compatible bolt carrier group in 338 ARC, a mil-spec lower receiver, a charging handle, and a fire control group.

Why does the Mk111 Mod 2-M use a free-float rail?

Free-floating the barrel isolates it from the upper receiver and handguard, reducing vibration and harmonics that can affect shot placement. This design improves consistency and accuracy across a wider range of loads and conditions.