Any links showing where someone was prosecuted and sentenced for "screwing up a trigger job"?
It's pretty easy to find lots of links where people have gone to jail for felony theft.
I was once told that the moon was made of green cheese.
The one that comes to mind is U.S. v Olofson
The government's lead attorney in the case stated the law does not exempt a malfunction. He claims that it states "any weapon that shoots more than once without manual reloading, per function of the trigger is a machinegun".
Olofson was convicted and sentenced to thirty months.