The PMR-30 is a light weight, full size pistol chambered for the flat shooting .22Magnum cartridge (.22WMR). The PMR-30 operates on a unique hybrid blowback/locked-breech system. This operation system allows for the use of a wide variety of ammunition as it seamlessly adjusts between locked breach and blowback operation, depending on the pressure of the cartridge. It uses a double stack magazine of a new design that holds 30 rounds and fits completely in the grip of the pistol.