A system facilitates one handed manipulation of a service pistol and includes a device having two components and related inserts that allow for single handed loading, cycling, firing, clearing and unloading of semi-automatic pistols. The present device includes a spine; and a retainer attached to the spine wherein the retainer comprises at least a first groove tapering from a first width towards the pivotal attachment between the cover and spine to a second width towards the front edge of the cover.