So, I purchased a Glock 22 several years ago from a friend just before the magazine ban took effect (in California). It was new or dang near new and came with two 15-round magazines. I bought a third mag from a local store a few weeks later. It sat in a safe for several years now. The mags have been stored empty. The problem I have is that it fails to feed the last round on any of the three magazines. I've used factory ammo and reloads but it seems to always do it. This G22 is the pre-finger grove model and pre rail version. Any ideas?