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Primary Weapons Systems152745056
Pws Mk111 Mod 1-M Upper 7.62X39 11.85 Ls Frc$1,176.10
Availability: In Stock
Current Stock: Out of stock
The Primary Weapons Systems MK111 MOD 1-M is a complete upper receiver built for shooters who demand reliability without compromise. Chambered in .223 Wylde with an 11.85-inch barrel, this compact upper pairs PWS's long-stroke piston system with a free-float M-LOK handguard to deliver the kind of performance you'd expect from a rifle designed for both civilian and professional use. The short barrel length makes it ideal for suppressed shooting, while the forged 7075-T651 aluminum construction meets mil-spec standards for durability and compatibility.
What sets the MK111 apart is its balance of ruggedness and refinement. The PWS long-stroke piston system runs cleaner and more reliably than direct impingement, with adjustable gas settings so you can tune it for your ammunition and accessories. The FRC 2-port compensator manages recoil and muzzle rise while staying suppressor-compatible with the Rearden Atlas mounting system. A Radian Raptor ambidextrous charging handle ensures smooth operation whether you shoot right or left-handed, and the forward assist provides positive round chambering in any condition.
Built in Boise, PWS barrels are known for precision, and the .223 Wylde chamber accepts both .223 Remington and 5.56mm NATO ammunition without compromise. Whether you're building a compact home-defense rifle, a suppressed range gun, or an SBR configured for hunting or tactical work, the MK111 MOD 1-M gives you a solid foundation with professional-grade components and the kind of attention to detail that separates purpose-built upper receivers from generic alternatives.
| Brand | Primary Weapons Systems |
| Product | MK111 MOD 1-M Upper Receiver |
| Caliber | .223 Wylde |
| Barrel Length | 11.85 inches |
| System Type | Long-stroke piston |
| Handguard | Free-float M-LOK |
| Upper Receiver Material | Forged 7075-T651 aluminum |
| Compensator | PWS FRC 2-port (suppressor-compatible) |
| Charging Handle | Radian Raptor ambidextrous |
The .223 Wylde chamber is designed to safely and accurately fire both .223 Remington and 5.56mm NATO ammunition, giving you flexibility in what you shoot without accuracy loss.
Yes. The MK111 MOD 1-M is fully forged and designed to mil-spec standards, ensuring compatibility with standard mil-spec lower receivers.
Yes. The 11.85-inch barrel length is recommended for suppressed shooting, and the FRC 2-port compensator is suppressor-compatible with the Rearden Atlas mounting system.
This is a complete upper receiver assembly. It will attach to a compatible lower receiver and bolt carrier group; verify your lower receiver specifications for proper fit.
SKU: 152742932 • Width: 4in • Height: 4in • Depth: 26in • Weight: 4.5oz
Availability: In Stock
Current Stock: Out of stock
The Primary Weapons Systems MK111 MOD 1-M is a complete upper receiver built for shooters who demand reliability without compromise. Chambered in .223 Wylde with an 11.85-inch barrel, this compact upper pairs PWS's long-stroke piston system with a free-float M-LOK handguard to deliver the kind of performance you'd expect from a rifle designed for both civilian and professional use. The short barrel length makes it ideal for suppressed shooting, while the forged 7075-T651 aluminum construction meets mil-spec standards for durability and compatibility.
What sets the MK111 apart is its balance of ruggedness and refinement. The PWS long-stroke piston system runs cleaner and more reliably than direct impingement, with adjustable gas settings so you can tune it for your ammunition and accessories. The FRC 2-port compensator manages recoil and muzzle rise while staying suppressor-compatible with the Rearden Atlas mounting system. A Radian Raptor ambidextrous charging handle ensures smooth operation whether you shoot right or left-handed, and the forward assist provides positive round chambering in any condition.
Built in Boise, PWS barrels are known for precision, and the .223 Wylde chamber accepts both .223 Remington and 5.56mm NATO ammunition without compromise. Whether you're building a compact home-defense rifle, a suppressed range gun, or an SBR configured for hunting or tactical work, the MK111 MOD 1-M gives you a solid foundation with professional-grade components and the kind of attention to detail that separates purpose-built upper receivers from generic alternatives.
| Brand | Primary Weapons Systems |
| Product | MK111 MOD 1-M Upper Receiver |
| Caliber | .223 Wylde |
| Barrel Length | 11.85 inches |
| System Type | Long-stroke piston |
| Handguard | Free-float M-LOK |
| Upper Receiver Material | Forged 7075-T651 aluminum |
| Compensator | PWS FRC 2-port (suppressor-compatible) |
| Charging Handle | Radian Raptor ambidextrous |
The .223 Wylde chamber is designed to safely and accurately fire both .223 Remington and 5.56mm NATO ammunition, giving you flexibility in what you shoot without accuracy loss.
Yes. The MK111 MOD 1-M is fully forged and designed to mil-spec standards, ensuring compatibility with standard mil-spec lower receivers.
Yes. The 11.85-inch barrel length is recommended for suppressed shooting, and the FRC 2-port compensator is suppressor-compatible with the Rearden Atlas mounting system.
This is a complete upper receiver assembly. It will attach to a compatible lower receiver and bolt carrier group; verify your lower receiver specifications for proper fit.
SKU: 152742932 • Width: 4in • Height: 4in • Depth: 26in • Weight: 4.5oz