Probably your stock barrel since they still broke in my Freak
I bought these paintballs because they were cheap, and i guess you get what you pay for. These balls curve like crazy. I think through the 500 that i shot today i would be lucky if 100 went straight. They went every which way but straight. I would not reccomend these paintballs to anybody because they suck horribly.
Only buy these if you are dead broke and need something to shoot.... I'd give it a 1 if it weren't for the fact that even though these balls suck i did have a good time today.