Very rarely, I get a front sight blade that just absolutely won't move, and I don't want to risk damage to the Luger front sight base or barrel band. So, I use a Dremel with a thin cut off wheel and cut a slot down thru the middle of the sight blade almost to the top of the dovetail on the sight base. The sight will then drive out easily..... and, BTW, Luger Doc and I sell front sight blades???...
.. best to all, til....lat'r....GT