About the Primary Weapons Systems MK118

This upper features an 18-inch barrel chambered in 6mm ARC, a cartridge known for its ballistic performance at extended ranges. Primary Weapons Systems' long-stroke piston operating system is integrated, which can offer a cleaner and cooler running action compared to direct impingement systems.

This upper is suited for precision shooting at medium to long distances, leveraging the 6mm ARC cartridge's capabilities. It can be used for hunting applications where permitted, or for target shooting and competition where accuracy and range are priorities.