Thanks for taking the time for the feedback, i was in two minds whether to put a empty mag click in, but a few people suggested to add it in. I dont think there is any lore around this, but reading some of the wiki's on the interwebs around the pulse rifle, they suggest that the internal mechanisim is a rotary type of electronic feed system. This was my take on that - more of resetting or unable to load the round due to the mag not being there.