This all stainless steel PowerHead is available with a barrel that accomodates .38, .38 short, .38 special, .357 Mag and .357 Max calibers. Also available for .44 caliber. They include a pin for safety, and a cable to secure the barrel to the power head.To waterproof the shell the manufacturer suggests using nail polish around the primer and also where the bullet presses into the casing. They fit 6mm threaded shafts.
An adaptor can be purchased to attach the power head to a hawaiian tip shaft.