Ok well I have had this P99 for a awhile now, I am not the original owner but I know him and I know it has not been shot a lot. This specific gun is an older QPQ full size chambered in .40cal. This was my first handgun so selling it is not really or any interest to me. Now for the problem, the I just shot 50 rounds of Blazer Brass 180gr out of it this afternoon and out the 50 rounds I had about 6-8 premature slide lock back. The last time I remember taking the gun to that range I has an issue with the gun (this could have just been me not holding the gun right, and I have not had this happen again..yet) firing two shots pre trigger pull. Right now I am just curious if anyone else on here has had a similar problem with a P99 or maybe even a different gun. Any help would be great before I contact Walther. Speaking of Walther, has anyone ever had to send a gun into Walther for service? If you have, what kind of service did they provide? Thanks in advance for any replies.