xangaurd

so i have a stock barrel on my trilogy sport and the monster balls i am using keep on rolling out. Does anyone know either a better ball to use with the stock barrel or a new barrel that would be better with the monster balls. I am buying a barrel on ebay and cant do the tests everyone tells me to do, and I would rather keep on using the monster balls, they work in my other guns well and when they don't roll out they work really well in my trilogy too.