I recently purchased a used M1A from someone in a gun show. 5 magazines came with it. An original Springfield 5 rounds, a 10 round and 3 20 rounds. I used the 5 round clip and fired the rifle for the 1st time. I was expecting it to eject the empty cartridge and inject the next round. That didn't happen. I manually ejected the empty cartridge and reloaded the next round. My ? is there a defect in my rifle or is the 5 round magazine supposed to perform like that? I haven't tried the other magazines yet.