You just file down the firing pin. Everyone knows that.We had an odd duck in our W&C class. During one of the breaks he went up to the instructor and asked about modifying an AR15 to fully automatic! LOL! The instructor just looked at him for a minute and said"I could tell you, but I'm not" LOL!
We all had a good laugh about that and started refering to the guy as the undercover agent.
I think he was just a goofball