I used to play paintball 30+ years ago in college, back before high capacity semi-automatic guns were even a thing. Accuracy was way more important back then since you couldn’t just spray an area with hundreds of shots a minute. We quickly learned that not only did dirt etc. in the barrel impact accuracy but the paintballs themselves could as well.

If they sat for a long period of time the liquid paint inside the ball could congeal slightly and stick to one side, throwing off the balance of the ball. So when you shot it, it would spin in a random way and hook noticeably. We learned to spin the balls briefly in a round Tupperware container before using them. That would spread out the paint inside the ball, making them more evenly balanced. The result was noticeably more accurate shots.

I’d expect to see the paintballs shot from this thing to hook quite a bit…