No such thing as a silly question.
The AIMCO Lugers that were black were also stainless. Stainless can be blackened by a chemical process similar to bluing. If the black is removed you will have a silver luger.
The stainless Lugers that were not blackened had a brushed finish, this is done by a buffing wheel with the appropriate type of medium. Your luger will not look like the brushed stainless ones if you remove the black. You could also use a scotchbrite pad to get the brushed look.