finally finished my .300 Whisper

[tdale4]

Originally Posted by kanton

tdale4,

How and why did you heat treat the zinc freeze plugs?

Thanks.

The freeze plugs are made from a zinc plated soft steel

I heated them up to red hot with a propane torch and quenched them in salt water. I did this twice. then I heated them up to red hot and quenched them in used motor oil

I did this because it is suppose to harden the steel and provide a longer life by reducing the erosion that occurs in a silencer