how do I make an adapter with interal threats for a phoenix 25 ACP? And where can I find the state laws on this subject?
You want a supressor for a Phoenix? I'm calling bullshit and doubt you're serious, so here is the easiest way to go about it. Contact your state's Attorney General's office for the legality. As for the mechanics, I'm no help. I'll just buy my supressors from people who make good ones.