@C-Diddyso for loading I pull the case all the way down so the feeder locks, I then slide it up just far enough so I can drop bbs in the gap, and fill with bbs. I then shut the mag and press the feeder release.
as for leaks, had 4 now. 2 base plate seals, 1 fill valve, and on release valve. Silicone and a tightening here and there seems to solve the issues.