anything medium grade or above. obviously, the better paint, the better accuracy.
Light, quiet, accurate, GREAT shoot-through, durable
Tips can be a hassle, carbon fiber means no squegee
This past Friday I went paintballing with my new barrel for the first time. Its kinda an indoor warehouse/urban type of field. I was shooting Brass Eagle Monster balls which are pretty low-end. minutes into the game, the differance this barrel makes began to shine through. I was more accurate and a whole lot quiter. After the game, i examened my barrel and realized i'd broken one-two balls; i hadn't even seen a change in accuracy. After a few more games, a friend and I compared sound levels. My a5 running co2 and no regs was twice as soft as his a5 w/ regulators, nitro, and the stock barrel. This is really a tremendous, high quality barrel. The only possible weakness would be the tips (i had to tighten mine a few times b/4 it really stayed on the way i wanted it to).
Really a GREAT barrel. Perfect for the a5. If your sick of your stock barrel or flatline GET IT!!!!!!!!