Hoot has it right: "Eugen, I have that issue unless I pull down on the Drum after it locks in. Lock toggle open, insert Drum until it locks in place, pull down on Drum, close toggle as normal (no push needed). Works that way for me. Maybe I'm just lucky."
I too found that my toggle would not release as it was hitting the top/rear edge of the drum, so I had to tug down so it was down against the mag. release in order to let the toggle go forward. No biggie, just part of the fun.
dju
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