Hi, Welcome to the forum. Nice clean looking refinish! Never seen the Mauser name engraved on the front frame like that. Did they do the restoration?
There are a few different feed problems, so a description would help.
There are a couple of different recoil springs used in Lugers. The WW-I guns used a spring with fewer turns than are commonly used with the later Mausers. I believe it's 18 turns for the older guns, and 20 for the later ones.
Full NATO spec ammo may be too fast burning and strong for our guns. In the USA plain old White box Winchester (often available at WalMart) seems to work well for many people.
The magazine spring can also be an issue.
But... There is one thing that I learned. Your grip support as you fire your Luger has to be fairly tight and consistent. It needs the initial resistance of your hand and arm to allow the toggle to unlock and terminate it's stroke properly.
When I paid some attention to my own grip and arm position, I cleared up some problems I was having with feeding.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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