The Luger is very sensitive to how you grip and support the gun while firing.
It needs a relatively strong consistent support in order to cycle properly.
I don't think you can Lubricate a Luger into a FTF problem. There are some things to take a look at. One is how hard the toggle rear is hitting the receiver when firing. Put a little masking tape right at the back of the receiver under the place where the toggle will hit it. Take a look at how consistent this is hitting, and how hard.
After verifying that the magazines are OK, you might need a replacement recoil spring.
These later Mauser Lugers use the higher count (21 turn) recoil springs.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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