[DonVoigt]

Anyway, what are the mechanical vulnerabilities of the pistol? Can I reasonably expect it to hold up to being shot now and then?

Yes,

Is your pistol in 7,65 or 9mm?

There are many opinions as to what might break. The ejector is one item, and is replaceable.

Using standard ammo, I would not worry about a luger "breaking" any more than any other pistol- assuming it has not been abused int he past.

Post pictures of your luger when you can!