Noah, sounds like the same thing that happened to me today on my first outing with my loaded fullsize.It happened every other round and i had to rack the slide to eject a round and chamber a new one. it seems to me that the round is getting stuck between the mag and the barrel. it didn't happen as often the more i shot. I only shot 100rds. i hope this is only a break in deal. it seems as the slide isn't closing hard as needed. i've taken the pistol down did a little work with some emery and cleaned/lubed. i'll try again tomorrow.