Originally Posted by Lee
My guess would be that you have a bad paint to barrel match since you were getting higher velocity with the stock barrel.Are you using Co2 or HPA.Co2 will give you higher pressure(unless the HPA is adjustable)and therefore higher velocity.
I'm running Co2... How much bigger is the ID on a J&J vs. the stock ID? I find it tough to believe that it'll make that much of a difference. I was thinking because of all the porting, that'd be more of a problem. But I'll give it a go with some other paint and see what happens.