I just bought this gun a few weeks ago from a reputable dealer. I attempt to chamber a round and the cartridge gets stuck and the slide doesn't go all the way forward. The only way to get the round out is to release the magazine and pull back the slide and the round falls out. I own an H&K .45 Expert, H&K P7M8, and a safe full of firearms and have never had this happen. I'll try to make a video so you can see what's going on. I was going to take it back to the dealer but it's about 4 hours north of here and I won't be up there any time soon. Any ideas?