You misunderstand me. Removing the mag disconnect may not make the gun unsafe.
But if there is an accident later that does not involve you as the "holder" of the gun, you could STILL be held liable for modifying the gun, and removing a safety. The arguement would be that the gun would not had fired, had "gbelleh" not modified the gun...
(attorney presenting to jury)
"Who KNOWS what other things were done to make this gun unsafe! "gbelleh" has admitted to making one modification that was IN NO WAY APPROVED by the manufacturer. In addition, "gbelleh" is not a certified gunsmith. We *just don't know* what damage he may have done in the process of making this unsafe modification. And THAT, ladies and gentlemen of the jury, is why "GBELLEH" should be held liable for the destruction caused by his improperly modified weapon!"
The jury will be composed by "gun idiots". You know who I mean. They will be selected deliberately that way, so it will be easier to win a case. They will hear about the unapproved modification, and the fact you are not a "certified" Bersa gunsmith. Plus any other damaging testimony that can be brought up.