I have a glock 27 and tried many types of ammo most were 180 grain and I get many non firing rounds I do the safty wait and reload the round and it works fine. The pin strikes the primer but no boom. I get about 3 or 4 rounds out of a box of 50 that do this. Now I take my Glock 23 with the same ammo and it works fine except the sellor & Bellot both guns didnt shoot well with them. I would send it to Glock but if this gets lost in the mail Im really screwed I live in Mass. and our laws REALLY stink cant get new glocks here.If I knew what part to be looking for I would order it and take care of the problem. Im sure there could be a few things to look for but what would be a good start. I really could use the help Thanks Brian Piche'