Primary Weapons Systems152747137
Pws Mk116 Mod 2-M Upper 16.1" Blk$1,399.95
Availability: In Stock
The Primary Weapons Systems MK116 Mod 1-M Upper is a 16.1-inch complete upper receiver built for shooters who demand reliability without compromise. Built around PWS's acclaimed long-stroke piston system, this upper trades the direct-impingement design found on most ARs for a proven alternative that runs cleaner and cooler—especially valuable if you plan to shoot suppressed or log serious round counts. Whether you're building a precision rifle for the range, a duty gun, or a versatile all-rounder, the MK116 Mod 1-M bridges the gap between mil-spec familiarity and purpose-built performance.
The upper ships with a free-float MLOK handguard that decouples the barrel from the fore-end, which is the gold standard for accuracy. You get a Radian Raptor ambidextrous charging handle for smooth, intuitive operation regardless of your shooting hand, and PWS's own FSC 556 muzzle device to manage recoil and muzzle rise. The barrel is chambered in .223 Wylde—a smart choice that handles both .223 Remington and 5.56 NATO safely and accurately. Internally, fully forged 7075-T651 aluminum receivers maintain mil-spec dimensions, so it bolts seamlessly onto any compatible lower.
The piston system is fully adjustable, letting you dial in gas flow for your specific ammunition, suppressor, or shooting conditions. That tuning capability is one reason piston uppers appeal to shooters who value consistency across different loads. Forward assist controls are integrated for those situations where you need a round chambered decisively—useful in training, competition, or duty scenarios. PWS stands behind the build with their warranty covering defects and issues on all their products.
| Barrel Length | 16.1 inches |
| Chambering | .223 Wylde |
| System Type | Long-stroke piston |
| Receiver Material | Forged 7075-T651 aluminum |
| Handguard | Free-float MLOK |
| Charging Handle | Radian Raptor (ambidextrous) |
| Muzzle Device | PWS FSC 556 |
| Finish | Black |
Yes. The MK116 Mod 1-M is built to mil-spec standards and will fit any compatible AR-15 lower receiver. The forged aluminum receivers maintain standard dimensions for drop-in compatibility.
Yes, and it's optimized for suppressed fire. The adjustable piston system lets you tune gas flow to minimize back pressure and gas blowback when running a suppressor, delivering a cleaner and more comfortable shooting experience.
The .223 Wylde chambering is designed to safely and reliably fire both .223 Remington and 5.56 NATO ammunition. This versatility makes it flexible for different loads and purposes.
PWS's long-stroke piston design reduces fouling by directing combustion gases away from the bolt carrier, keeping the action cleaner and cooler during extended shooting. The adjustable gas block also allows you to dial in performance for your specific ammunition and conditions, and the system is particularly beneficial for suppressed shooting.
SKU: 152742935 • Width: 4in • Height: 4in • Depth: 33in • Weight: 5.24oz
Availability: In Stock
The Primary Weapons Systems MK116 Mod 1-M Upper is a 16.1-inch complete upper receiver built for shooters who demand reliability without compromise. Built around PWS's acclaimed long-stroke piston system, this upper trades the direct-impingement design found on most ARs for a proven alternative that runs cleaner and cooler—especially valuable if you plan to shoot suppressed or log serious round counts. Whether you're building a precision rifle for the range, a duty gun, or a versatile all-rounder, the MK116 Mod 1-M bridges the gap between mil-spec familiarity and purpose-built performance.
The upper ships with a free-float MLOK handguard that decouples the barrel from the fore-end, which is the gold standard for accuracy. You get a Radian Raptor ambidextrous charging handle for smooth, intuitive operation regardless of your shooting hand, and PWS's own FSC 556 muzzle device to manage recoil and muzzle rise. The barrel is chambered in .223 Wylde—a smart choice that handles both .223 Remington and 5.56 NATO safely and accurately. Internally, fully forged 7075-T651 aluminum receivers maintain mil-spec dimensions, so it bolts seamlessly onto any compatible lower.
The piston system is fully adjustable, letting you dial in gas flow for your specific ammunition, suppressor, or shooting conditions. That tuning capability is one reason piston uppers appeal to shooters who value consistency across different loads. Forward assist controls are integrated for those situations where you need a round chambered decisively—useful in training, competition, or duty scenarios. PWS stands behind the build with their warranty covering defects and issues on all their products.
| Barrel Length | 16.1 inches |
| Chambering | .223 Wylde |
| System Type | Long-stroke piston |
| Receiver Material | Forged 7075-T651 aluminum |
| Handguard | Free-float MLOK |
| Charging Handle | Radian Raptor (ambidextrous) |
| Muzzle Device | PWS FSC 556 |
| Finish | Black |
Yes. The MK116 Mod 1-M is built to mil-spec standards and will fit any compatible AR-15 lower receiver. The forged aluminum receivers maintain standard dimensions for drop-in compatibility.
Yes, and it's optimized for suppressed fire. The adjustable piston system lets you tune gas flow to minimize back pressure and gas blowback when running a suppressor, delivering a cleaner and more comfortable shooting experience.
The .223 Wylde chambering is designed to safely and reliably fire both .223 Remington and 5.56 NATO ammunition. This versatility makes it flexible for different loads and purposes.
PWS's long-stroke piston design reduces fouling by directing combustion gases away from the bolt carrier, keeping the action cleaner and cooler during extended shooting. The adjustable gas block also allows you to dial in performance for your specific ammunition and conditions, and the system is particularly beneficial for suppressed shooting.
SKU: 152742935 • Width: 4in • Height: 4in • Depth: 33in • Weight: 5.24oz