George and Jerry have pretty much put their finger on the problem. A drum magazine can be as clean as a whistle but unless it is really well lubricated it isn't going to push the rounds out. There is just too much friction of the rounds inside the drum case for the spring to overcome. I do not think a thin layer of silicone will do the job. If you find an original trommelmagazin that hasn't been messed with and open it up, chances are that you will find the interior coated with old grease.
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If it's made after 1918...it's a reproduction
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