PWS MK111 MOD 1 Upper Receiver - .223 Wylde, 11.85" Barrel with Triad Muzzle DevicePrimary Weapons Systems$1,029.49
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Primary Weapons Systems
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.
| Caliber | .223 Wylde |
| Barrel Length | 11.85 inches |
| Barrel Twist | 1:8 |
| Piston System | PWS long-stroke (carbine-length) |
| Gas System | 3-setting adjustable |
| Upper Receiver | Forged |
| Handguard | PicLok free float (Picatinny and M-Lok compatible) |
| Muzzle Device | Triad556 compensator |
| Charging Handle | Radian Raptor |
| Weight | 3 lb. 14 oz. |
| Overall Length | 20.5 inches |
| Velocity (Typical) | 2741 ft/sec |
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.
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.
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.
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.
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.
Primary Weapons Systems
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.
| Caliber | .223 Wylde |
| Barrel Length | 11.85 inches |
| Barrel Twist | 1:8 |
| Piston System | PWS long-stroke (carbine-length) |
| Gas System | 3-setting adjustable |
| Upper Receiver | Forged |
| Handguard | PicLok free float (Picatinny and M-Lok compatible) |
| Muzzle Device | Triad556 compensator |
| Charging Handle | Radian Raptor |
| Weight | 3 lb. 14 oz. |
| Overall Length | 20.5 inches |
| Velocity (Typical) | 2741 ft/sec |
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.
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.
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.
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.
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.