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mdarms 20rnd drum problems

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The drum's spring tension is set for high brass out of the box.

Drum's have much more spring force pressing the shells against the bottom of the bolt when fully loaded than the sticks.


To overcome this, mike recommends correctly polishing & profiling the bolt to reduce friction.

Of course if your gun's borderline undergassed that could contribute to the issue.


With my service, I include free pin gauges so you know where you stand port-wise.


I can nearly guarantee yours is a gun issue not a drum issue.

The MD-20 is the most reliable mag out of the box next to the Russian 5s & 8s from my experience.

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