[Cobra64]

A quick firing pin change and your good idea just became a joke.

How's that work?

[Al Gator]

The number one method of "stamping" the casing is to have the s/n imbedded in the head of the firing pin. I have not heard of any other method, and can't think of how else you would be able to print the s/n on the case.

Simply change the firing pin, and you have done away with the stamp.