The Primary Weapons Systems PWS MK116 MOD 1-M Upper 338ARC 16.1 LS FRC is a dedicated upper receiver assembly designed for shooters who want to run the 338 ARC cartridge in a modern AR-style platform. Built around PWS’s proven long-stroke piston system, this upper is engineered to deliver smooth cycling, reduced fouling, and consistent performance with a variety of loads.
This upper is ideal for enthusiasts looking to upgrade an existing lower for range use, training, or hunting with the efficient 338 ARC round. Its 16.1-inch barrel length offers a practical balance of maneuverability and ballistic performance, while the integrated muzzle device and handguard layout support precise shooting and accessory mounting. Backed by Primary Weapons Systems’ reputation for innovation in piston-driven AR uppers, the MK116 MOD 1-M Upper provides a refined, purpose-built option for serious shooters.
- Manufacturer: Primary Weapons
- Model: PWS MK116 MOD 1-M Upper 338ARC 16.1 LS FRC
- Finish: Black
- Category: Assembled Upper Receiver
- Feature: 16.1" Long-Stroke Piston
| __Firearm Type | Rifle |
| __Model | MK116 MOD 1-M |
| __Capacity | NA |
| __Caliber | NA |
| __Barrel Length | NA |
| __Optic Footprint | NA |
| __Action | NA |
