My Glock G22 Gen4 has not had a single failure with .40 cal ammo. I say that because I have a 9mm conversion barrel for it. I would say I was getting about 30% failures with 9mm. After some research I bought a G17 recoil spring, which in the gen4 but not the gen3 is different than the one for the G22. I now use that spring with the conversion barrel and have not had a single failure.
|