your rigt i just thought about that right ebfore i read what you said.
and there is no such thnig as simulated closed bolt because "an object in motion tends to stay at motion, but the paintball doesnt have enough time to slow down unless the barrel if smaller than the paint. thusly there is (almost) no such thing as simulated closed bolt.
ph yes and by the time the paintbal leaves the barrel it is traveling about 250 fps and doesnt lose speed untill about halfway through its flight. (thats proves what you said)