Pws Mk114 Mod 2-M Upper 223Wylde 14.5 Thread

The PWS MK114 Mod 2-M upper receiver is a complete .223 Wylde upper built on Primary Weapons Systems' proven long-stroke piston platform—a choice for shooters who demand reliability over fouling-prone direct-impingement designs. This 14.5-inch upper ships with a 1/2-28 threaded muzzle ready for suppressors, brakes, or compensators (sold separately), and it's engineered to run clean and consistent across a wide range of ammunition types and shooting conditions. Whether you're building a suppressed precision rifle, an SBR, or a go-to duty upper, the MK114 Mod 2-M delivers the adjustability and accuracy you need without the complexity.

At the heart of this upper is PWS's adjustable gas system—a three-position setup that lets you dial in the right amount of gas flow for your specific load, suppressor, or environment. Run suppressed? Tune it down for softer shooting and less blowback. Pushing hot ammo unsuppressed? Crank it up. That adaptability means you're not fighting the gun; the gun works for you. The .223 Wylde chamber handles both .223 Remington and 5.56mm NATO ammunition, so you're never locked into one loading.

Handling is handled by a Radian Raptor ambidextrous charging handle—smooth, reliable, and equally comfortable for southpaws and right-handers. The handguard merges Picatinny rail and M-LOK slots, giving you flexibility to mount optics, lights, and grips without forcing a single mounting standard. Boise-made precision barrels back a sub-MOA accuracy guarantee when paired with quality ammunition, so this isn't a plinker—it's a workhorse capable of real precision.

Key Features

• PWS long-stroke piston system for reduced fouling and proven reliability
• Three-position adjustable gas block for tuning to ammo, suppressors, or conditions
• .223 Wylde chamber accepts both .223 Remington and 5.56mm NATO
• 1/2-28 threaded muzzle for suppressors and muzzle devices (not included)
• Sub-MOA accuracy guarantee with quality ammunition
• Hybrid PicLok handguard combining Picatinny and M-LOK mounting
• Radian Raptor ambidextrous charging handle
• Suppressor-optimized for cleaner cycling and reduced back pressure

Specifications

Frequently Asked Questions

Can I use this upper with both .223 and 5.56mm ammo?

Yes. The .223 Wylde chamber is specifically designed to safely and accurately fire both .223 Remington and 5.56mm NATO ammunition.

Is this upper suppressor-ready?

The muzzle is threaded 1/2-28, and the adjustable gas system is optimized for suppressed use. However, the suppressor itself is not included and must be purchased separately. You'll also need a muzzle device or suppressor mount to attach one.

Does this come with a charging handle and handguard?

Yes, the MK114 Mod 2-M includes both the Radian Raptor ambidextrous charging handle and the PicLok hybrid handguard.

What's the difference between the adjustable gas settings?

The three-position adjustable gas block lets you tune gas flow for your specific ammunition type, suppressor setup, and shooting environment. This ensures optimal reliability and reduces unwanted back pressure or short-stroking across different loads.