Description
Most ARs run direct impingement, which means hot gas and carbon get dumped straight into the receiver. The PWS MK116 Mod 2-M takes a different path with a long stroke piston system, the same basic operating concept that made the AK famous for running dirty and running forever. The payoff is a rifle that stays cleaner, runs cooler, and shrugs off high round counts with minimal maintenance. A 3-setting adjustable gas system lets you dial it in for different ammo or tune it down when you hang a suppressor on the end, cutting back pressure and gas blowback in the process.
Accuracy the MK116 Mod 2-M Can Back Up
The 16.1 inch .223 Wylde barrel is made in Boise, Idaho and carries a 1:8 twist, so it stabilizes everything from light 55 grain plinking loads to heavier match bullets, and it handles both .223 Remington and 5.56 NATO. PWS stands behind these barrels with a sub-MOA guarantee using quality ammunition. Up front, the FRC 2-port compensator tames recoil and muzzle rise and works with the Rearden Atlas mounting system, so going suppressed is about as simple as it gets. At roughly 6.8 pounds unloaded, this rifle swings fast and carries easy.
Ambi Controls and Top-Shelf Parts on the Mod 2-M
The forged 7075-T651 receivers were designed in-house with fully ambidextrous controls, so lefties get the same access to the safety, mag release, and bolt release as everyone else, and a Radian Raptor charging handle rounds out the ambi setup. The lower features a flared magwell, integrated trigger guard, and a slick-side design that deletes the forward assist for a cleaner profile. The 15 inch PicLok handguard accepts both M-LOK and Picatinny accessories, so whatever lights or grips you already own will bolt right up. A PTFE-coated Mil-Spec Enhanced trigger, an enhanced buffer system with H2 steel buffer, and Magpul furniture finish out a rifle that needs nothing before its first range trip. The flat top upper ships optic ready, so pick your glass and get to work.
Key Specifications
- Manufacturer: Primary Weapons Systems
- Model: MK116 Mod 2-M
- MPN: MK1-M2R-223-16
- UPC: 811154033086
- Caliber: .223 Wylde (accepts .223 Rem and 5.56 NATO)
- Action: Semi-Auto, Long Stroke Piston System
- Gas System: Mid-Length, 3-Setting Adjustable
- Barrel Length: 16.1"
- Twist Rate: 1:8
- Muzzle Device: PWS FRC 2-Port Compensator (Rearden Atlas compatible)
- Receivers: Forged 7075-T651 Aluminum, Fully Ambidextrous
- Handguard: 15" PWS PicLok Free-Float (M-LOK and Picatinny)
- Charging Handle: Radian Raptor Ambidextrous
- Capacity: 30+1 Rounds
- Overall Length: 32.75"
- Sights: Optic Ready
What’s Included
- PWS MK116 Mod 2-M rifle
- One 30-round magazine
- Rifle service tool for gas adjustment
- Owner's manual
Frequently Asked Questions
What's the advantage of the long stroke piston system in the MK116 Mod 2-M?
Instead of venting hot gas and carbon into the receiver like a direct impingement AR, the piston system keeps the action cleaner and cooler. That means less scrubbing after range trips and better reliability over long strings of fire. It's the same operating concept that earned the AK its reputation for durability, refined for the AR platform.
Is the PWS MK116 Mod 2-M a good suppressor host?
It's one of the best in its class. The 3-setting adjustable gas system lets you turn gas down when suppressed, which cuts blowback and keeps the rifle from getting overgassed. The FRC compensator is also compatible with the Rearden Atlas mounting system, so many suppressors thread right on without swapping muzzle devices.
Can I shoot both .223 Remington and 5.56 NATO through this rifle?
Yes. The .223 Wylde chamber is designed to safely handle both cartridges, and it typically delivers better accuracy than a standard 5.56 chamber. The 1:8 twist barrel stabilizes a wide range of bullet weights, from light varmint loads up to heavier match ammo.
How accurate is the MK116 Mod 2-M out of the box?
PWS backs it with a sub-MOA accuracy guarantee when fired with quality ammunition and solid fundamentals. The barrels are precision made in Boise, Idaho, and independent reviews have reported groups in the three-quarter inch range at 100 yards from this platform. For a piston gun under 7 pounds, that's excellent performance.





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