I'm guessing the firing pins are a bit too long and sticking. I bet the 'smith' just uses added pressure and forces the gun open and sees what happens..... probably nothing? I have an old beater Lang SLE 16b that sticks with most shells. I think the firing pins are a 'hair' too long, but I'm no gunsmith. I just pry it open....maybe I'm a dumbass?? Likely so, I guess. But it keeps shooting after prying it open. :-)

Socialism is almost the worst.