Odd things that can go wrong...

With your 1911.

What happens:
The firing pin and firing pin channel could have the wrong geometry, or some grit might get in there.  Or the spring fails.  Or the Series 80 firing pin block goes Tango Uniform.

What this causes:
The hole the pin comes out of gets peened over.  You fire a round and the firing pin stays poked out a little bit.

"OH NOES, T-BOLT!  DOES THIS MAKE MY GUN GO FULL AUTO."

Well, no.  With the pin sticking out like that the back of the case can't slid up the breech face and under the extractor hook.  The gun will fail to feed and your range day is done.