I recently purchased a 911, the pocket-sized, lightweight 380 acp. I have taken it to the range twice. I have tried 7 different rounds in the gun, firing about 50 shots with the slide locking back after all shots, save one. The RO diagnosed the problem, finding the end of the slide stop is bumping the case of the top round in the magazine, engaging the slide stop. Neither he nor I had seen this happen before. I am awaiting a response from Springfield and will let them make the repair. This gun appears to be well constructed, aside from this flaw. It feels good in my size XXL hands. I am hoping to find customer service as good as that at RCBS.