Make sure it's also been cleaned and properly lubricated.
The magazine is the most likely cause, but if a new MecGar magazine doesn't solve the problem, consider replacing the recoil spring. if the recoil spring is the problem, you might see finish damage or peening on the rear of the frame where the rear toggle hits it. Ensure that you get the right spring, as the .30 Luger DWM Alphabet Commercial uses a different one than the 9mm and other Lugers.
I don't have my copy of Sturgess right now, but it specifies the correct recoil spring if you need one.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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