It is not known whether the sleeve gun was actually used in the field. According to the SOE catalogue, the assassin lets the gun slide into his hand and presses the muzzle against the victim, whilst pulling the trigger with his thumb. As the gun is only a few inches in length, it can then once again be hidden up the sleeve. The bullet cartridge remains within the gun, so there is no tell-tale evidence left lying around. The gun had a range of up to three yards, but allowed only one shot.