Primary Weapons Systems 6mm ARC Rifles Deliver Piston Reliability and Long-Range Precision

Boise, ID (December 18, 2025) – Primary Weapons Systems (PWS) continues to set the standard for precision, reliability, and innovation with the MK118 MOD 2-M, a long-range rifle chambered in 6mm ARC. Designed for shooters who demand uncompromising accuracy and versatility, the MK118 MOD 2-M reflects the balance of modern engineering and proven performance that defines the PWS platform.

Built for precision shooters, hunters, and tactical professionals, the MK118 MOD 2-M delivers flat trajectories, reduced recoil, and exceptional energy retention, all powered by PWS’s renowned Long Stroke Piston System. This piston-driven architecture is celebrated for its reliability and reduced fouling, providing consistent performance across a wide range of conditions. The rifle’s three-setting Adjustable Gas System allows users to fine-tune for specific ammunition and environmental variables, including suppressor use.

Every MK118 MOD 2-M is crafted to achieve sub-MOA accuracy with high-grade ammunition, thanks to PWS’s precision-manufactured barrels made in Boise, Idaho. The 18-inch barrel features a 1:7.5 twist rate, offering excellent stability across the 6mm ARC cartridge spectrum. At just 7.3 pounds unloaded, the rifle maintains a maneuverable profile without sacrificing reach or ballistic performance. The PWS FRC 2-Port Compensator effectively mitigates recoil and muzzle rise while remaining fully compatible with the PWS PUB mount, enabling streamlined suppressor attachment within the PWS ecosystem.

The MK118 MOD 2-M receiver set is precision-machined from 7075-T651 forged aluminum and anodized for long-term durability. The ambidextrous lower receiver, designed in-house by PWS, eliminates the forward assist while integrating a flared magwell and enlarged trigger guard for rigidity and ergonomic handling. The PicLok handguard further enhances adaptability by combining Picatinny and M-LOK attachment interfaces for maximum accessory flexibility.

Additional components include a Radian Raptor ambidextrous charging handle for smooth manipulation from either side, a PTFE-coated Mil-Spec Enhanced Trigger, and the PWS Enhanced Buffer System with a 1.2-inch diameter buffer tube, ratchet-lock castle nut, and built-in QD mount. Paired with a Magpul MOE SL Carbine Stock and MOE K2 Grip, the MK118 MOD 2-M delivers confident control and reliable handling in any environment.



The MK118 MOD 2-M reflects PWS’s ongoing commitment to precision manufacturing. Direct Metal Fusion 3D printing, advanced CNC machining, and rigorous in-house assembly ensure that each rifle leaves the factory ready for real-world performance. These same production standards apply across the PWS lineup, including the MK114, which is also available in 6mm ARC and offers a shorter, lighter option that is optimized for mobility without compromising the advantages of the ARC cartridge.

Every PWS firearm is backed by the PWS VOW, which guarantees repair or replacement in the event of defects to ensure total customer confidence. For more information on the MK118 MOD 2-M, the MK114, and other PWS rifles, visit primaryweapons.com.

PWS MK118 MOD 2

• Caliber: 6mm ARC
• Weight: 7.3 lbs
• Barrel: 18″
• Twist Rate: 1:75
• Operating System: PWS Long Stroke Piston With 3-Setting Adjustable Gas
• Muzzle Device: PWS FRC 2-Port Compensator
• Receiver: 7075-T651 Forged Aluminum Ambidextrous
• Trigger: Mil-Spec Enhanced
• Rifle MSRP: $2,099.95
• MK114 MOD 2 Upper MSRP: $1,399.95

PWS MK114 MOD 2 

• Caliber: 6mm ARC
• Weight: 6.9 lbs
• Barrel: 14.5″
• Twist Rate: 1:75
• Operating System: PWS Long Stroke Piston With 3-Setting Adjustable Gas
• Muzzle Device: PWS FRC 3-Port Compensator
• Receiver: 7075-T651 Forged Aluminum Ambidextrous
• Trigger: Mil-Spec Enhanced
• Stock / Grip: Magpul MOE SL Stock & MOE K2 Grip
• Rifle MSRP: $2,099.95
• MK114 MOD 2 Upper MSRP: $1,399.95

About Primary Weapons Systems

Primary Weapons Systems, Inc. (PWS) is a federally licensed firearms manufacturer based in Boise, Idaho, specializing in tactical and sporting rifles and accessories. We machine our components in-house on state-of-the-art CNC equipment and source any additional parts from trusted, top-tier partners. As a company of shooters—from machining and assembly to quality control and support—we build products that are both highly functional and visually refined. Our mission is to deliver exceptional quality and customer service to shooters, sportsmen, military, and law enforcement at a fair, competitive price. We value long-term customer relationships and welcome direct feedback by phone or email.

For more information, visit www.primaryweapons.com