So I'm still trying to improve the color case hardening procedure that im doing and have some more questions. At what time are yall starting the time for the parts to soak at the 1350 temp. Is it when you visually see the crucible with a dark cherry glow or when the door is shut and the furnace is building up temp. I usually cook the parts for the one and a half to 2 hours before I drop it to 1150 before I quench in order to prevent warpage. I start the 2 hours when I see the crucible is glowing. Is this too long?? I am still getting some side plate warpage where the fingers of the side plate attach to the receiver. The receiver does have spacers to prevent warpage but still does. Does anyone use lower temps? Thanks Hereford