Another 'pencil test' is to drop a pencil down the barrel eraser-first, then pull the trigger. If the pencil jumps out of the gun, the firing pin is working. This works great on a .45, but on a 9mm with a smaller 'bolt' face, the extractor gets in the way and the firing pin can't reach the eraser. You have to use a smaller wood dowel.
The best test for a .30 cal. Luger is, if you can't tell by just looking, carry a .30-06 bullet and see if it drops into the muzzle - if it does, it's a 9mm.
__________________
You can lead 'em to the water, but you can't make 'em drink.
|