Make sure that you firmly seat the fully loaded 50rd mag into place (or at least firmly push it down) on a closed breech block, or else it might stick up a little and eventually cause failures to feed.
It's similar to inserting a 30rd AR-15 mag with a closed bolt, or inserting a fully loaded Glock mag on a closed slide. Except in this case, the mag will stay "down" due to gravity but won't be fully seated.
It's similar to inserting a 30rd AR-15 mag with a closed bolt, or inserting a fully loaded Glock mag on a closed slide. Except in this case, the mag will stay "down" due to gravity but won't be fully seated.