The part about the slide going back on its own was happening before I even touched it with sandpaper.
I will take it to the range again and test this out with ammo.
The thing you guys need to keep in mind though, is that not everyone has owned guns for years. This is my first handgun. It just didn't make sense for it to be doing that with different magazines.
”Gun control is like trying to reduce drunk driving by making it tougher for sober people to own cars.”