UMAREX HDP50: Useless

UMAREX is a German armaments manufacturing company selling Home Defense Pistols in South African known as HDP 50cal. These pistols are defective in that the gas leaks out of the pistols instantaneously after a few shots are fired. I have established that this is apparently a fairly common problem from Security Hyper store from whom I purchased the pistol. They advise that the seal/ORing is apparently defective and requires replacement. This is the third time now that I have had this happening. Please guys, don't ever purchase this piece of junk since you will only experience ongoing hassles as I and others have with the UMAREX HDP50