quick ? on barrels

Few things...

1. Yes, the paint in the paintballs is liquid, but it's thick and sticks...  It will spin with the shell, but it acts as a drag on the shell, so it will slow it down, but not all that quickly...  This is why you get those wild "corckscrew" shots when you break paint in the barrel or hopper.
2. The ONLY testing I ever saw publiched stating that rifling works on round projectiles was witten by the Father of one of the Execs of Hammerhead, a company that makes (get this) rifled barrels.
3. Technically, if you shot a flatline in Zero Gravity it would fly in a straight line forever.  Unless you're in a controled and pressurized environment like the International Space station, where the ball would indeed fly up.  Reason being, without gravity there can be no atmosphere, and thus nothing for the spin of the ball to interact with.

BTW, Thanks for sharing the info from the A5OG!

  so is a J&J rifled barrels? or does all rifled barrels have to have a certain design to make it rifled?? 

my thought is, is that its just a scam to try to sell their products more. they make things up or stretch t he truth

Rifling works on real firearms because the reaction that takes place, when fired, causes a release of heat, which in turn makes the bullet expand and catch onto the grooves (causing it to spin). Since in a paintball there is no source of heat (i.e.- gunpowder), they don't expand on firing, meaning they don't catch rifling very well. Also, you would need a pretty much absolute exact paint to barrel match to get close to a rifling effect.

I believe rifling does have a minimal effect on paintballs because the force of the bolt slamming into the ball causes it to deform, making it wider, and thus, catch the rifle grooves. Interesting fact, when a baseball player hits a pitch, the same effect happens to it - for a matter of milliseconds, it becomes deformed and wraps around the front of the bat.