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Primary Weapons Systems built the MK114 Mod 1-M for people who want a piston-driven AR without giving up the familiar feel and controls of a traditional M4-pattern gun. The long stroke piston keeps hot gas and carbon out of the receiver, so the bolt carrier stays noticeably cleaner and the whole system runs cooler through long range sessions. This particular configuration ships with a bare threaded muzzle and no muzzle device, which is exactly what you want if you plan to pin and weld your own comp or set the barrel up for a can.
Underneath the forged 7075-T6 upper sits PWS's one-piece operating unit, where the piston and bolt carrier work as a single group connected by an op rod. Fewer separate parts banging around means fewer failure points and less fussing with maintenance. The three-position adjustable gas regulator is the real workhorse here, letting you dial the gun down when running suppressed to cut back pressure and gas blowback, or open it up for reliable cycling with whatever ammo you feed it.
The 14.5" mid-length barrel carries a 1:8 twist and a true .223 Wylde chamber, so it happily runs both .223 Remington and 5.56 NATO while squeezing out solid accuracy from lighter and heavier bullet weights alike. The free-float M-LOK handguard measures roughly 13.6 inches with a full-length Picatinny top rail, giving you plenty of real estate for optics, lights, lasers, and hand stops. A Radian Raptor ambidextrous charging handle comes installed, which is a nice touch for lefties and anyone who runs an optic-forward grip.
This is a complete upper in the truest sense, coming assembled with the bolt carrier group and charging handle so you can drop it onto your favorite mil-spec lower and go. It retains the forward assist, keeping the manual of arms identical to a standard AR. PWS backs the whole thing with their lifetime warranty, which speaks to how they feel about their own build quality.
No. This version ships with a bare threaded muzzle and no muzzle device installed. That leaves the barrel open for you to pin and weld your own comp or flash hider, or set it up with a direct-thread suppressor mount or other accessory.
Yes. The MK114 Mod 1-M uses a forged upper built to the M4-type pattern and drops onto any mil-spec AR-15 lower. It arrives complete with the bolt carrier group and charging handle, so you just mate it to your lower and you are ready to shoot.
The long stroke piston keeps hot gas and carbon out of the receiver, so the bolt carrier stays much cleaner and the system runs cooler over extended shooting. Cleanup often amounts to a quick wipe down instead of scraping baked-on carbon. The adjustable gas setting also makes it well suited to running a suppressor by trimming back pressure and blowback.
Yes. The .223 Wylde chamber is designed to safely and accurately run both .223 Remington and 5.56 NATO. That flexibility is one of the big reasons the Wylde chamber is so popular for range and general-purpose use.
| UPC | 811154033482 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MK1-M1U-223-14-NC |
| Action | |
| Barrel Finish | Anodized |
| Barrel Length | 14.5" |
| Caliber/Gauge | .223 Wylde |
| Color | Black |
| Length | 14.5'' |
| Model | |
| Product Type | Upper |
| Style | Complete |
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