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Primary Weapons Systems built the MK216 for people who want a .308 that runs like it owes them money. This complete upper is chambered in .308 Win / 7.62 NATO with a 16.1" barrel and a 1:10 twist, and it drives the whole thing on the PWS long-stroke piston system rather than a standard direct impingement setup. That piston design is borrowed from the AK world and refined with AR tolerances, so you get the reliability people love about the AK combined with the accuracy and familiar handling of an AR-10. The result is a smooth recoil impulse that feels more like a steady push than a sharp slap.
The long-stroke piston runs the operating rod and bolt carrier together as one unit, which cuts down on carrier tilt, cam pin wear, and carrier bounce that can plague other piston guns. One of the biggest real-world perks is how clean it stays. Piston operation keeps a lot of the fouling out of the action, so you spend less time scrubbing and more time shooting. PWS also eliminated the forward assist and added lightening cuts, giving the MK2 line a distinctive look while trimming weight without feeling flimsy.
The three-setting adjustable gas block is where this upper really earns its keep. You can tune the gas flow to match your ammo or throttle it back when you thread on a can, which cuts down on gas blowback and keeps the rifle running smooth. The PWS FRC 3-Port tapered compensator is suppressor-compatible and does a genuine job taming muzzle rise and felt recoil. Pair that with the free-float M-LOK handguard and Radian Raptor ambidextrous charging handle, and you have a platform that's ready for optics, lights, and whatever else you want to hang on it.
This is a complete upper, so it drops onto a compatible .308 MK2 lower and you're most of the way to a finished rifle. It's a strong pick for anyone building out a suppressed .308 or wanting a piston-driven upgrade over a standard DI gun.
The MK216 runs on the PWS long-stroke piston system instead of routing hot gas back into the action like a DI gun. The operating rod and bolt carrier move together as a single unit, which reduces carrier tilt and keeps fouling out of the receiver. In practice that means a smoother recoil impulse and less frequent cleaning.
Yes, it's practically built for it. The three-setting adjustable gas block lets you tune down the gas when you thread on a can, which cuts back on excess blowback and gas to the face. The FRC compensator is also suppressor-compatible and works with PWS mounting hardware.
This is a complete upper designed to run on a PWS MK2 .308 pattern lower. Because the piston system and its components are specific to the PWS platform, it's best matched with a PWS MK2 lower for guaranteed fit and function. If you're building on a different .308 lower, check compatibility before you buy.
For a piston-driven .308, the MK216 has a strong reputation for accuracy thanks to PWS holding tighter machining tolerances than a typical AK-style piston gun. Shooters running quality match ammo through the platform report tight groups and consistent performance. The 16.1" barrel and 1:10 twist handle a wide range of .308 loads well.
| UPC | 811154033413 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MK2-M2U-308-16 |
| Barrel Length | 16.1" |
| Caliber/Gauge | .308 / 7.62 NATO |
| Color | Black |
| Model | |
| Product Type | Upper |
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