i am building a rifle and am nearly finished with the action. now, i know it needs some heat treating to provide a good service life. i understand how it works and have no qualms about building my own heat treating oven. however i dont expect to need the heat treating equipment again any time soon and would be interested in having the heat treating done by an outside source. i have heard that facilities that can do this will not touch gun parts. is this a reasonable assumption or do i just need to find a willing shop? the steel in question is 4140 and 4340. if having it done is not really an option, has anyone got any suggestions for my heat treating furnace based on their experience?