Since two good magazines have the feed problem that might not be likely.
I would try white box Winchester before changing things out. Lugers can be quite finicky... A 10% reduction in the powder load in my handloads helped solve my similar feed problem. Using 124gn rather than 115gn bullets in the ammo may help.
It might be worth a replacement recoil spring. Check with LugerDoc here (let him know the problem, he gives good advice - and can also do the work for you).
Springs are also available in kits with a variety of strengths from sites like midwayusa.com and brownells.com - Wolff spring makes the kits.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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