With a hicap mag, it needs a fair few BB's in the mag to feed properly, otherwise a small handful will always remain in it.
You've got a few WW2 guns and some kit, are you aware of the big WW2 community?
http://ontarioairsoftwwiireenactors....8307bda7381bf4
Up near Ottawa, we have our big annual event in September, OP Woodsman... check it out:
https://sites.google.com/site/operationwoodsman/home