two more observations:
1. when i put less bb in the mag (about 2/3) the problem occurs less often
2. de-mix gave he hint to check if the blockback-unit is in flush with the rail inside the slide and to adjust it with a thin layer of paper (eg) if not. i tried it and it seems to have an impact on the problem. (actually it seems to solve the problem but creates new problems instead...)
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