The only parts I normally heat treat are the springs, frizzen, tumbler/fly, and sear. Hardening should be the same for all. Just make sure they are hard to start; test with a file. I temper the frizzen to 375F, the springs to 700F, and the tumbler/fly to 500F and the sear to 590F. I also temper set triggers to 590F. I polish the parts (springs/triggers) to be heat blued and reheat to 560F. These temps have come from instructions from and conversations with Chambers, L&R, and Davis.