PWS MK118 MOD 2-M 6mm ARC Rifle, Black

Description

The PWS MK118 MOD 2-M 6mm ARC Rifle, Black, is a piston-driven AR built for shooters who demand precision without the fouling of a direct-impingement system. Chambered in the flat-shooting 6mm ARC, this rifle mates the round’s low-drag ballistics with PWS’s long-stroke piston to deliver consistent operation, reduced carbon buildup, and reliable cycling across a wide range of conditions. At $2199.95, it’s a purpose-built tool for hunters and target shooters who appreciate mechanical refinement over flashy gimmicks.

Manufacturer	Primary Weapon Systems (PWS)
Model	MK118 MOD 2-M
Material	7075-T6 aluminum upper and lower receiver, 416R stainless steel barrel (per manufacturer specs)
Compatibility	6mm ARC ammunition; accepts standard AR-15 lower parts and magazines
Finish	Type III hard coat anodized black
Weight	7 lb 8 oz (empty, per manufacturer specs)
Condition	New

Key Features

• PWS Long-Stroke Piston System – WHY IT MATTERS: This self-regulating piston reduces fouling in the bolt carrier and receiver by 80% compared to DI guns, meaning you can shoot hundreds of rounds without cleaning and still get first-round hits.
• Three-Setting Adjustable Gas Valve – WHY IT MATTERS: Dial in gas flow for standard loads, adverse conditions, or suppressed use without tools—this ensures reliable cycling even when using a suppressor or running hot ammunition.
• 6mm ARC Chambering – WHY IT MATTERS: The 6mm ARC delivers 30% less wind drift at 600 yards than 5.56 NATO and retains more energy downrange, making it ideal for precision hunting of varmints and medium game out to 800 yards.
• Magpul MOE Furniture – WHY IT MATTERS: The Magpul MOE stock and grip provide a familiar, ergonomic interface with a non-slip texture and comfortable length of pull, reducing fatigue during long sessions at the bench or in the field.
• 15-Round Magazine Capacity – WHY IT MATTERS: A 15-round magazine balances firepower with ergonomics, giving you enough rounds for follow-up shots without the bulk of a 20- or 30-round mag when stalking or shooting from a pack.

Who It’s For

This rifle is for the traditional shooter who values mechanical reliability over novelty. It suits hunters who need a flat-shooting, low-recoil cartridge for prairie dogs, coyotes, or deer, and target shooters who want a gas gun that can hang with bolt actions at 600-800 yards. If you’re tired of cleaning carbon off a DI bolt and want a rifle that runs clean and consistent, this is your tool.

Pros & Cons

• Pros: Reduced maintenance compared to DI ARs; adjustable gas for suppressed use; excellent long-range ballistics with 6mm ARC; quality 7075-T6 receiver set; Magpul furniture is durable and replaceable.
• Cons: Heavier than comparable DI rifles (7.5 lb vs 6.5-7 lb for some DI builds); the 6mm ARC ammunition is still less common than 5.56 or .308, so you may need to order online.

Comparison vs. Competitors

Feature	PWS MK118 MOD 2-M	Geissele Super Duty 6mm ARC	Zev Technologies AR-15 6mm ARC
Operating System	Long-stroke piston	Direct impingement	Direct impingement
Barrel Material	416R stainless steel	4150 Chrome Moly Vanadium	416R stainless steel
Gas Adjustment	3-position tool-less	Fixed gas block	Low-profile, non-adjustable
Weight (empty)	7 lb 8 oz	6 lb 12 oz	6 lb 10 oz
Furniture	Magpul MOE	Geissele G10 handguard & ACH	Zev handguard & stock
Price	$2199.95	$2,499	$2,399

FAQ

What type of ammunition does the PWS MK118 MOD 2-M require?

This rifle is chambered exclusively for 6mm ARC ammunition. It uses standard AR-15 magazines and is optimized for 108-110 grain match or hunting loads. Do not use 6.5 Grendel or other cartridges.

Can I suppress this rifle without adjusting the gas system?

Yes—the three-setting adjustable gas valve includes a suppressed position. Simply rotate the valve to the appropriate setting for use with a suppressor to reduce over-gassing and port noise.

What is the barrel twist rate?

Per manufacturer specs, the barrel has a 1:7.5 twist rate, which stabilizes 108-110 grain bullets effectively for long-range accuracy.

Does the rifle come with a rail for mounting optics?

Yes, it includes a full-length M-LOK handguard with a continuous top Picatinny rail for mounting scopes, red dots, and accessories.

Why Buy from Us

• ✔ Nationwide delivery (all 50 states)
• ✔ Ships 1-2 business days
• ✔ 30-day returns
• ✔ Secure checkout

Last updated: April 2026

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