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I am a machinist by trade and just happen to like guns also, so here is my question.....
I have an older Hi-Standard Model B .22cal and my firing pin has broken due to it not being cleaned well over the years when my grandfather had it.
So I am so inclined to machine my own for it out of Titanium in my down time at work, is this illeagle in any way shape or form? I can't find a logical reason in my head why it would be, but I know the fellas at the good old ATF and I differ on things from time to time.
If possible please provide where you got the info.
Thanks

There's no problem with doing so for personal use. You could even machine an AR lower (or complete firearm) for personal use, although the frame would require a serial number IIRC.

OK, when I read this I was thinking "Now why would a titanium firing pin be illegal?"