Went to the local range Saturday and fired my .45 acp G30. I was shooting mostly commercial reloads using both the G30 and a Colt OM .45. I also shot my carry mags, for both guns, that had Hornaday Critical defense rounds. I believe they were from the same box. Anyhow I had two hang-fires(?)/misfires(?). The primers had good deep impact marks but the rounds never went off. I have never had that happen before and it was a little scary. These are supposed to be self defense rounds and are not cheap. My immediate guess is I got a bad box of ammo, but I was wondering how frequently Glock's have firing pin springs that are too weak and how often they need changing This gun does not have 1000 rounds through it and I never had this trouble with any of my Colts. I have written Hornaday but have had no response. Needless to say I will never carry this brand again and I now have one expensive box of .45 range ammo and 1.5 boxes of expensive 9mm range ammo. Does anyone know if there is a way to test the firing pin force or spring force? My guess is that it was the ammo but you can never be too cautious with carry guns. Does the fact that all of the reloads were fine prove that the factory ammo was bad? I test the Colts after cleaning by "firing" a pencil but doing that with the Glock doesn't really do much. Anybody got any advise?? Should I install an extra power spring or just a OEM spring? or could it be the FP?