those grip wrapping the tube from the gas can should be more forward to the barell of the gun.
i was playing paintball a week ago for 5 hours in a row inside an old hall with 2 floors. the main floor was like a construction yard and the cellar was an abandonded one with lots of armoires, even an old washing room like in a scary horror movie and very dark. we where a group from the university playing 6vs6 and it was lots of fun! man was i exhausted the next day.
thats why i remember the grip thing, my gun missed it so i had to hold it with one hand or at the barrel and that was unconfortable, others had those grip and it was made so a hand could fit inbetween the grip and the trigger safety.

looking forward to seeing more from this game, may i ask what you study and where?
greetings!