Model 98 won't shoot straight

Check the velocity, clean the barrel and look for broken paint in the hopper and in the chamber.

Oh, and check the paintballs for deformities.


Edited by Mack - 10 March 2013 at 1:22am

What velocity is it firing at?


Is there a velocity screw in place in the marker?

The velocity is jumping from 235 to 280??? And yes there is a velocity screw in the gun.

Sounds like bad paint, or bad paint to barrel match.

If the paintballs are much smaller than the bore, air is going to escape all around the ball as it's being propelled down the barrel causing two issues. 1) Inconsistent velocity and 2) poor accuracy.

I had this issue with my autococker as paint kept getting smaller and smaller in diameter. Either finding a paint that works well consistently with your barrel and sticking with it, or getting a barrel that will accept various diameter inserts (freak kit, kaner kit, etc) so you can match the insert to the paint you are using that day.

Also, the barrel length can actually contribute to velocity issues and inaccuracy by increasing drag and requiring more air to get the ball up to the muzzle velocity you desire. As a general rule of thumb established over a decade ago on this forum and others, 11.5"-14" is the optimum barrel length.

If I end up getting a shorter barrel what is the best choice, but at a decently low cost.

Parts Tech wrote: J&J barrels are not to much ($30-$35), yet they are still good quality.

QFT! They also tend to run a little tighter on the bore, but without being so tight as to cause breakage of larger stuff. If you're going to go with a non-kit barrel, the J&J ceramic is one of the forum favorites. I still use one on my Autococker and Mini.