I just used some to test fire my MP5. Using an unknown plastic 90 rd mag. While hand loading with a loading tool (not a hand loader) I noticed that the BB's weren't coming back up to the top when I removed the tube and rod. First thing was that the spring was messed up but it turns out that 2 VA BB's managed to wedge themself side by side somewhere in the middle of the mag.
With my M4. I had to crank the hopup all the way to full to get some test firing done.
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