Peter, Welcome to the forum.
There is quite a bit to study about Lugers. In fact, we often recommend studying before buying one, but you have done this in reverse...
An LP.08 artillery model (which is the forum you posted in) has a long 8 inch barrel with adjustable tangent sights.
The majority of German military Lugers are P.08 model and have 4 inch barrels and fixed sights.
There are also Lugers made for commercial sale, and a huge number of variations.
If you search the Internet for "Artillery Luger" and look at pictures, you should get an idea of what they are.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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