well i'm new to the forum and to handguns in general so hopefully someone could help me out here, so i inherited my fathers police issue glock 22 a few years back, and i disassembled it to clean and oil it up and then went to the range to try it out, on the first shot i had problems with the slide staying in the locked back position and every shot after that, i know it does this when the magazine is empty but its doing this after every round, so i have to manually release it and then fire, is this a common problem or an easy fix hopefully? could i have not assembled it correctly? any info would be greatly appreciated.