Almost fully modded SG5-K lost flashlight and magazine unexpectedly. Neither of two remaining magazines in inventory could be equipped. Issue specific to SG5-K, since both CR-527 and FX-45 could swap out magazines.
I attempted to empty SG5-K magazines and refill, drop gun/magazines to ground, have other players attempt to reload gun. None of this worked.
SG5-K was only "worn" condition