[mrerick]

Trevor, welcome to the forum. First, I'm sorry for the loss of your grandfather, and thankful for his service.

You have a rare and sought after variation of luger in what appears to be very high condition.

This is a collectible firearm. With the correct holster, matched magazine and tool it is even more rare.

Absolutely do not fire it. A broken part would considerably affect it's value.

As mentioned, don't store it in the holster, and don't do anything that would alter it or it's condition. Much of it's high value is in it's original condition.