Looking for some advice. I recently bought a Star Model F .22LR pistol, the Target version with the 7" barrel. The pistol is a single action semi-auto, ten round capacity. The gun does not have a slide latch. I took it to the range today, loaded it up, fired one shot, next time I pulled the trigger the gun emptied itself -- all 9 rounds. I loaded it two more times, same result. I showed the gun to the range officer and it went full auto on him too. Any technicians out there who could shed some light on this? I'd like to get the pistol working properly. Thanks in advance for any advice.