PWS MK118 MOD 2-M 6mm ARC AR-15 Rifle - 18" - 1x 30rd Mag

When you want piston-driven precision in the efficient 6mm ARC cartridge with an 18" barrel optimized for long-range performance and sub-MOA accuracy, the Primary Weapons Systems MK118 MOD 2-M delivers the PWS Long Stroke Piston System, a 3-setting Adjustable Gas System, and a sub-MOA guarantee from a Boise-made barrel — and ships with a 30-round magazine ready to run.

The Primary Weapons Systems MK118 MOD 2-M is an AR-15 rifle designed for precision shooters, hunters, and tactical users who want the flat trajectory, reduced recoil, and exceptional energy retention of 6mm ARC in a piston-driven, suppressor-optimized 18" platform with sub-MOA accuracy standards.

The 6mm ARC was developed specifically to deliver long-range performance from the AR-15 platform — exceptional ballistic coefficients, flat trajectories, and retained energy at distance that outperform 5.56 NATO significantly at range. The PWS Long Stroke Piston System keeps the receiver group clean and cool through extended firing sessions, and the 3-setting Adjustable Gas System allows precise gas flow tuning for standard use, suppressor use, and different ammunition types without tools. PWS backs their Boise-made 18" barrel (1:7.5 twist, optimized for all 6mm ARC loads) with a sub-MOA accuracy guarantee using high-grade ammunition. The ambidextrous lower receiver — machined from 7075-T651 forged aluminum — eliminates the forward assist while incorporating a flared mag well and built-in trigger guard for a rigid, uncompromising platform. The PicLok handguard combines Picatinny and M-LOK in a single system for maximum accessory flexibility, and the Radian Raptor ambidextrous charging handle and Magpul MOE SL stock and MOE K2 grip round out a fully refined, ready-to-shoot package at 7.3 lbs unloaded.

Caliber: 6mm ARC. Barrel: 18", 1:7.5 twist, PWS precision, .223 Wylde-pattern chamber. Muzzle: PWS FRC 2-Port Compensator (Rearden Atlas suppressor compatible). Trigger: PTFE-coated mil-spec enhanced, 5.5–6.5 lbs. Buffer: Enhanced H2 Steel Body Buffer with 1.2" enhanced tube, ratchet lock, QD mount. Stock: Magpul MOE SL Carbine Stock. Grip: Magpul MOE K2. Weight: 7.3 lbs unloaded. Includes 1x 30-round magazine.

7075-T651 forged aluminum ambidextrous receiver with Type III anodize. PWS Long Stroke Piston System reduces fouling and heat in the receiver group. Sub-MOA accuracy guarantee with high-grade ammunition from PWS's Boise, Idaho precision barrel facility.

An outstanding choice for precision hunters, long-range target shooters, and tactical users who want 6mm ARC's ballistic advantages in a piston-driven, suppressor-ready 18" platform with PWS's industry-leading accuracy standard.

Backed by the PWS VOW — Primary Weapons Systems' warranty guaranteeing repair or replacement for any manufacturing defects. Precision manufactured in Boise, Idaho, USA.