Thread Protector or Brake for threaded rifle barrel muzzle

[paul73]

To meet the ATF spec you need to use silver solder that has a melting point above 1100 degrees F (593 digress C) or weld over a hardened steel pin. But as others have said, if the ATF or the police are trying to remove your brake from your gun, you’re already in a lot of trouble.

alloy i used is a Zn based stuff i use for drone powerline soldering, it is hard as a rock and a very high temperature solder, it is just fine. it is good enough to sustain 200A current.
i am not going to lose my sleep over the solder alloy compounds on a muzzle break.