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Primary Weapons Systems152746903
Pws Mk116 Mod 2-M Upper 338Arc 16.1 Ls Frc Comp$1,430.69
Availability: In Stock
Current Stock: Out of stock
The Primary Weapons Systems Mk116 Mod 1-M upper receiver in .338 ARC with a 16.1-inch lightweight free-floating barrel brings serious capability to a modern intermediate cartridge platform. Built for shooters who want to step up from 5.56 NATO without the weight penalty of a full-length .338 Lapua or .300 Win Mag, this upper pairs a proven AR-15 ergonomic foundation with the superior ballistics and energy retention of .338 ARC—a cartridge that's gained traction among long-range hunters and precision rifle competitors. The 16.1-inch profile keeps the gun handy for field use while still wringing impressive velocity from the .338 ARC's case capacity.
PWS' Mk116 platform is known for reliability and attention to detail. The free-floating barrel design isolates the tube from stock pressure, promoting consistent accuracy shot to shot. Combined with the Mod 1-M generation improvements, this upper is built to support serious precision work whether you're zeroing at distance on the range or in the field. The lightweight construction makes sense for a cartridge that punches well beyond its recoil profile.
This is a complete upper assembly, so it's a straightforward drop-in fit to any standard AR-15 lower receiver you already own—no guesswork on compatibility or barrel threading. If you're running a .338 ARC rifle or building one, PWS' track record in precision rifle components speaks for itself.
| Caliber | .338 ARC |
| Barrel Length | 16.1 inches |
| Barrel Profile | Lightweight, Free-Floating |
| Platform | AR-15 Upper |
| Manufacturer | Primary Weapons Systems |
The Mk116 Mod 1-M is a standard AR-15 upper assembly and will fit any mil-spec AR-15 lower receiver. It's a direct drop-in—no modifications needed.
Yes. The .338 ARC is a legitimate hunting cartridge, and the 16.1-inch barrel length keeps the upper reasonably light and maneuverable while still delivering solid velocity and energy for field use at hunting distances.
The product is the Mk116 Mod 1-M upper assembly. For details on what components are included, please contact our team—we'll confirm the exact configuration shipped with your order.
.338 ARC offers a middle ground: it delivers significantly more power and range than 5.56 NATO from a similar-size package, but weighs less and recoils less than a full .308 Winchester. It's ideal for shooters who want precision capability beyond 5.56 without the weight and recoil of a larger magnum.
SKU: 152744483
Availability: In Stock
Current Stock: Out of stock
The Primary Weapons Systems Mk116 Mod 1-M upper receiver in .338 ARC with a 16.1-inch lightweight free-floating barrel brings serious capability to a modern intermediate cartridge platform. Built for shooters who want to step up from 5.56 NATO without the weight penalty of a full-length .338 Lapua or .300 Win Mag, this upper pairs a proven AR-15 ergonomic foundation with the superior ballistics and energy retention of .338 ARC—a cartridge that's gained traction among long-range hunters and precision rifle competitors. The 16.1-inch profile keeps the gun handy for field use while still wringing impressive velocity from the .338 ARC's case capacity.
PWS' Mk116 platform is known for reliability and attention to detail. The free-floating barrel design isolates the tube from stock pressure, promoting consistent accuracy shot to shot. Combined with the Mod 1-M generation improvements, this upper is built to support serious precision work whether you're zeroing at distance on the range or in the field. The lightweight construction makes sense for a cartridge that punches well beyond its recoil profile.
This is a complete upper assembly, so it's a straightforward drop-in fit to any standard AR-15 lower receiver you already own—no guesswork on compatibility or barrel threading. If you're running a .338 ARC rifle or building one, PWS' track record in precision rifle components speaks for itself.
| Caliber | .338 ARC |
| Barrel Length | 16.1 inches |
| Barrel Profile | Lightweight, Free-Floating |
| Platform | AR-15 Upper |
| Manufacturer | Primary Weapons Systems |
The Mk116 Mod 1-M is a standard AR-15 upper assembly and will fit any mil-spec AR-15 lower receiver. It's a direct drop-in—no modifications needed.
Yes. The .338 ARC is a legitimate hunting cartridge, and the 16.1-inch barrel length keeps the upper reasonably light and maneuverable while still delivering solid velocity and energy for field use at hunting distances.
The product is the Mk116 Mod 1-M upper assembly. For details on what components are included, please contact our team—we'll confirm the exact configuration shipped with your order.
.338 ARC offers a middle ground: it delivers significantly more power and range than 5.56 NATO from a similar-size package, but weighs less and recoils less than a full .308 Winchester. It's ideal for shooters who want precision capability beyond 5.56 without the weight and recoil of a larger magnum.
SKU: 152744483