U.S. Marine Corps achieves Full Operational Capability for advanced MK22 sniper rifle

“Fully Operational Capability is achieved when all the Infantry and Reconnaissance units, as well as MOS-producing schools, have been fielded to and new equipment training is completed,” explained Major Michael Billings, Weapons Team Lead at Marine Corps Systems Command.

The MK22 was introduced to the Marine Corps through a collaborative effort involving multiple branches of the Department of Defense. Originally developed under a Special Operations Command contract, the rifle transitioned to the Marine Corps through the “Special Operations Forces (SOF) to service” process, with the U.S. Army overseeing contracting actions.

“This collaboration accelerated the entire program, pushing us to FOC a full year ahead of schedule—a significant win for the Marine Corps and our warfighters,” said Billings.

The MK22 offers modularity with calibre conversion options, allowing it to adapt to mission-specific requirements. The rifle features barrels chambered in 7.62mm, .300 Norma Magnum, and .338 Norma Magnum, providing increased range and precision for diverse operational scenarios.

“The M317 Precision Day Optic (PDO) paired with the MK22 is a game changer,” said Brian Nelson, MK22 Project Officer. “The M317 PDO is a 7-35 Variable Powered Optic, a huge leap in capability over our previous sniper systems like the M40 and MK13.”

Each MK22 rifle kit includes three barrels, hard and soft carrying cases, a sound suppressor, the M317 PDO with a scope mount, and a comprehensive cleaning and tool kit. Reconnaissance and Infantry units also receive additional equipment, such as a .300 Winchester Magnum barrel, a scout sniper tripod kit, a laser filter unit, and an anti-reflection device.

The MK22’s design prioritises operational efficiency. It replaces two older rifle systems, reducing the logistical demands on units while streamlining equipment requirements for Marines. “Marines like the ability to conduct calibre conversions at their level and the fact that they only have one rifle instead of the two it replaced,” said Kevin Marion, Logistics Management Specialist with Marine Corps Systems Command.

Sustainability is another key feature of the MK22. Maintenance is now possible at the organisational level, eliminating the need for time-consuming repairs at higher maintenance echelons. Barrels can be replaced quickly, ensuring the rifle remains operational even if one component fails.

“[Replacing a barrel] was impossible with previous systems, where a condemned barrel would render the weapon unusable, directly affecting mission readiness,” said Nelson. “Now, the MK22 ensures that even if a barrel fails, Marines are still mission ready.”