as pointed out, the paint has the greatest effect on velocity consistency (barring any issues with the tank / gun regulator). paintballs are not perfectly round nor exactly the same size. they all have a minimum and maximum diameter (ie, all slightly oblong), and very in size within the bag. the more consistent the paint, the more consistent the fps.
i recently tested my automag (10 shots per test, three different tank regs (pmi reactor, ga myth, ninja)) using marballizers that i hand-sorted to be as consistent in size as possible, but they were more out-of-round than usual. i averaged +-15 fps. it was worse than my tippmann a-5 using the same tanks and paintballs (+-14 fps)! i'll have to clean the reg / piston and slap a new reg seat on and test again. i also have another automag i can try out.
*edit*
so i cleaned the reg on my automag, and installed a new piston o-ring and reg seat just because i could, and got the same results (+-15 fps). my other automag was +-10 fps though. *shrugs*
i recently tested my automag (10 shots per test, three different tank regs (pmi reactor, ga myth, ninja)) using marballizers that i hand-sorted to be as consistent in size as possible, but they were more out-of-round than usual. i averaged +-15 fps. it was worse than my tippmann a-5 using the same tanks and paintballs (+-14 fps)! i'll have to clean the reg / piston and slap a new reg seat on and test again. i also have another automag i can try out.
*edit*
so i cleaned the reg on my automag, and installed a new piston o-ring and reg seat just because i could, and got the same results (+-15 fps). my other automag was +-10 fps though. *shrugs*
Comment