Interesting you should bring up paintball guns. Back in the day, paintball teams used the Nelspot paint pistol, used for marking trees and cattle,
because that was all that was available. The local team here was pretty bad, beating Tennessee, Canada, and won the finals against New York. They were
always trying to modify the pistols to make them go farther, hit harder, etc. They opened up the gas storage chamber inner diameter, etc., but it
always resulted in a ball bobbling in the gun and breaking, throwing just liquid paint out the barrel. After looking at the problem, a modification
was done to the physical design of the gas tube. In its original form the gas came out at two holes, set at 90 degree angles to the path of the
barrel. A modification to this tube (home manufatured tube required) put these two holes now damn near parallel to the path in the barrel, they ended
up being an oblong hole instead of round because they were machined to be 1 deg. off of parallel to the barrel path that they injected the gas into.
Smoke blown into the old tube (Thanks, ciggies!) showed almost immediate turbulence as the stream exited the holes, while on the modified the streams
came out smooth until ambient air breezes caused wavering turbulence about 2 ft out from the exit holes. This caused the ball to be trapped in the gas
stream so it could not hit the inner sides of the barrel, and it was virtually frictionless, like a ping-pong ball floating in a vacuum cleaner air
stream. One player fired it over a rifle radar and clocked the paintballs at a little over 800 fps! They took them to game play, and the paintballs
fired from these modified guns put saucer-size bruises on those they hit; in fact, one guy got hit in the temple and it flat knocked him out. There
was so much bitching by opposing teams that the people who ran the local game took one of the guns apart after testing it and made that particular
design of gas tube ILLEGAL for game play.
Don't underestimate a paintball gun. With this tube installed in an old Nelspot, and a marble or right size ball bearing in it, one could
theoretically f*** someone up big time, if not permanently. How do I know this? I'm the designer, no brag, just fact. My machinist buddy still has a
plaque from the team that they gave us for "HOT GUNS". FYI
Ah, the 80's were so much more fun........
[edit on 28-1-2009 by ibgrimme]