Pws Mk116 Mod 2-M Upper 16.1" Blk

The Primary Weapons Systems MK116 Mod 2-M is a complete rifle upper receiver built around PWS's proven long-stroke piston platform—a no-compromise choice for shooters who demand reliability and shootability in a mid-length package. This is a true piston-driven upper, not the direct-impingement designs that dominate the market, which means cooler, cleaner operation and the inherent reliability that comes with the system. At 16.1 inches, the barrel length strikes a practical balance between velocity, maneuverability, and sight radius, making it equally at home on the range, in competition, or in a duty-grade build.

The upper receiver itself is fully forged from T6 7075 aluminum and hard-anodized for durability—you can see and feel the difference from MIM'd or cast alternatives. PWS engineered the MK116 Mod 2-M without a forward assist, paired with a flared magazine well and integrated trigger guard, choices that reflect modern rifle design and shooter preference. Charging is handled by a Radian Raptor ambidextrous charging handle, making the upper equally practical for right or left-handed shooters. The handguard system uses PWS's PicLok technology, which lets you mount both Picatinny rail and M-LOK accessories without proprietary adapters—genuine flexibility for optics, lights, and grips.

Topped with a PWS FSC 556 flash hider and chambered in 5.56 NATO with a .223 Wylde barrel, the MK116 is a versatile upper that pairs with any standard AR-15 lower receiver. The 1:8 twist rate and 2,980 fps velocity give you the ballistic flexibility to run anything from 55-grain varmint loads to heavier match and duty rounds. If you're building a precision carbine, a lightweight hunting rifle, or upgrading to a quality piston-driven platform, this upper delivers the engineering and function that sets PWS apart.

Key Features

• Long-stroke piston system for clean, reliable operation and reduced carrier tilt
• Fully forged T6 7075 aluminum upper receiver, hard-anodized for wear resistance
• PWS PicLok handguard accommodates both Picatinny and M-LOK mounting without adapters
• Radian Raptor ambidextrous charging handle
• Flared magazine well and integrated trigger guard for modern ergonomics
• No forward assist—streamlined design preferred by experienced shooters
• PWS FSC 556 flash hider included
• 5.56 NATO/.223 Wylde barrel for caliber compatibility

Specifications

Frequently Asked Questions

What lower receiver does this upper fit?

The MK116 Mod 2-M is a standard AR-15 upper receiver and will pair with any mil-spec AR-15 lower receiver. You're not locked into a proprietary platform.

Can I mount both Picatinny and M-LOK accessories on the handguard?

Yes. The PWS PicLok system is designed to accept both Picatinny rail and M-LOK attachments directly, without requiring separate adapters or rail sections.

Why is there no forward assist?

The forward assist is omitted by design. Many experienced shooters prefer the cleaner profile and find it unnecessary on a properly tuned, reliable piston-driven upper. If you prefer one, you'll want to confirm compatibility with your chosen lower receiver.

Is this upper suitable for precision shooting or hunting?

Yes. The .223 Wylde barrel, 1:8 twist, and quality forged construction make this upper capable across precision rifle, hunting, and competition applications. The piston system and integrated features prioritize reliability and shootability.