I Learned something interesting...
About using snap caps for function testing.
Don't.
Or, more precisely, don't trust the function just because a snap cap works.
A friend of mine uses the red metal snap caps (I forget the name). He got a new 1911.45ACP. Had it for a while, took it to the range a couple times, everything ok.
Then, one time, he loaded it, and didn't shoot it empty. He found out that it would NOT EJECT a loaded round. It would eject the snap cap, just fine, but NOT a loaded round. Even a short (shorter than ball) hollowpoint would hang up.
The snap cap, while about the same length as factory ball ammo, would clear the port, but a loaded round would not. The gun went back to the maker, and was fixed.
This was something I had never seen before, and taught me the lesson that a snap cap is NOT proper dummy ammo for function testing.