PWS MK111 MOD 2 UPPER 223 WYLDE 11.85

The PWS MK111 MOD 2 upper receiver in .223 Wylde represents a mature, battle-tested short-barreled platform built around Primary Weapons Systems' reputation for reliable piston-driven design. This 11.85-inch upper combines a 1:8 twist barrel, forged receiver, and PWS's carbine-length long-stroke piston system to deliver the kind of versatility that makes it equally at home in a hunting rig, tactical training course, or precision build. At 3 lb. 14 oz., it's engineered for the shooter who wants genuine performance without unnecessary weight.

The MK111 MOD 2 strips away the forward assist and adds practical features — a Triad556 compensator, a 3-setting adjustable gas system for tuning to different loads and suppressors, and a Radian Raptor charging handle. The real standout is the PicLok free float handguard, which lets you run either Picatinny or M-Lok accessories up front without compromise. That flexibility has earned the MK111 MOD 2 a solid following among PWS shooters and professionals who cycle the same upper through multiple mission profiles.

This is the upper only — you'll pair it with a compatible lower receiver to complete your rifle. Whether you're assembling a dedicated hog gun, a compact duty rifle, or an SBR for training, the MK111 MOD 2's piston reliability and gas adjustability handle suppressed and unsuppressed fire without the tuning headaches of direct impingement. The .223 Wylde chamber accepts both 5.56 NATO and .223 Remington ammunition, giving you ammunition flexibility at the range or in the field.

Key Features

• PWS carbine-length long-stroke piston operating system for reliable cycling across load variations
• 3-setting adjustable gas system for tuning to suppressors, ammunition, and environmental conditions
• Forged upper receiver for durability and precision fit
• PicLok free float handguard accepts both Picatinny and M-Lok accessories
• Triad556 compensator for recoil management and flash control
• 1:8 barrel twist rate optimized for a range of .223 and 5.56 projectile weights
• Radian Raptor charging handle for smooth, ambi-friendly operation
• No forward assist for a cleaner profile and reduced weight
• .223 Wylde chamber for 5.56 NATO and .223 Remington compatibility

Specifications

Frequently Asked Questions

What lower receiver will this upper fit?

The MK111 MOD 2 is an AR-15 upper receiver and will mate to any standard AR-15 lower receiver. This upper is sold as the upper only; you'll need to source and assemble a compatible lower to complete your rifle.

Is this upper suitable for hunting and tactical applications?

Yes. The MK111 MOD 2 has a proven track record in both hog hunting and law enforcement/SWAT training environments. The adjustable gas system, short barrel, and piston reliability make it adaptable to various mission profiles and ammunition types.

Can I run a suppressor on this upper?

Yes. The 3-setting adjustable gas system is designed to dial in reliable operation with suppressors. You can tune the gas port to optimize cycling for suppressed fire without over-gassing.

What ammunition does the .223 Wylde chamber accept?

The .223 Wylde chamber is compatible with both 5.56 NATO and .223 Remington ammunition, giving you flexibility in ammunition selection without sacrificing accuracy or precision.

What comes in the box with this upper?

The MK111 MOD 2 upper includes a rifle service tool for gas adjustment, a PWS sticker, and a PWS manual. The upper itself does not come assembled with a bolt carrier group or charging handle; however, the Radian Raptor charging handle is pre-installed on this model.