Luger that belonged to my dad during WWII

[Flying10uk]

With a pistol such as this that as this that has been in a fire would not having it reproofed be a sufficient test as to it's safety? With tool steels once hardened and tempered it is surprisingly difficult to bring the metal back to a softness at which it can be machined again. It normally involves placing the part in an oven and bringing up to around 800 degrees centigrade, depending on the type of tool steel involved, and allowing to cool very slowly. If this isn't done the steel will often retain much of it's hardness and be too hard to machine.