Originally Posted by Turpid Porpoise
Markers have a break in period in which your consistency could be all over the place.
^^^^ Very true, give the marker some time to break in and you will notice the marker slowly becoming more consistent.
Factors that will make your marker inconsistent:
-Air source (see other posts for CO2 issues)
-Regulator(s) on marker (regulators have a break in period)
-Markers firing system (needs to be broken in and/or lubricated)
-Paintball quality (inconsistent paintball size/shape normally found on cheaper paint)
-Barrel quality (normally goes hand in hand with paintball quality, even if you get a better barrel bad paint = bad shots)