New gun, fired 100 rounds, cleaned twice. Both times when putting the slide back on this is what happens. It will NOT move forward to release. Why is the front the guide spring coming out of the end of the barrel? I cleaned my MillPro many, many times and never had problems like this. The first time this happened on this gun, I set it down and later came back to it. Working the slide back and forth trying to the damn thing loose. It finally came forward. Is it something I'm doing wrong somehow?