Welcome to the confusing world of Lugers. They are the greatest guns ever, but no, you shouldn't shoot them. Never alter the original finish, except to have the grips repaired...I completely understand your confusion. It can be maddening, and none of us has the ultimate answer for others, only what we choose to do.
It is sort of a matter of personal choice, as you alone will bear the consequences.
I can not imagine a $1000 collectable piece being devalued by having the grip repaired, any more than having a new strap put onto a holster.
If it was an extremely high end gun, then leave it as-is.
Shoot it at your peril, as if it breaks the value will drop some, but in your case not all that far, maybe $200?
Now every one on this forum will have a different answer, so sit back and enjoy.
But in the mean time go have fun with your new Luger...
dju
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