CMMG Action Tuning Kit MkG/MkGs/MK57

The CMMG Action Tuning Kit is purpose-built to fine-tune the Radial Delayed Blowback action found on CMMG MkG, MkGs, and MK57 pistols and carbines. Designed to deliver the same kind of control that buffer weight changes or adjustable gas-block settings provide on a traditional AR-pattern rifle, this compact tuning set lets the end user dial in the feel, recoil impulse, and cycling characteristics of their Radial Delayed Blowback platform to match the ammo, suppressor, or shooting style they prefer.

The kit includes three steel action weights - a 1 oz weight, a 2 oz weight, and the 3.4 oz standard 9mm weight - giving shooters a usable range of bolt mass to experiment with. Three .250" x .625" roll pins are also included to secure the chosen weight during installation. The components ship in a matte black finish to match the rest of the MkG/MkGs/MK57 action.

Whether you are optimizing for suppressed shooting, light-recoil training loads, or simply refining the lockup of your Radial Delayed Blowback host, the CMMG Action Tuning Kit gives you the hardware to make meaningful changes without swapping out complete bolts or bolt carrier groups.