"Depending on the amount of people you are playing with and the style you play capacity doesn't matter. The people I play with are SWAT, Army, and Navy trained. All of which know how to use a gun. In 2 games the swat officer didn't use more than 20 bb's 2 of which he got 2 kills with. If you're a support player go for mid-cap so you only have to tug the string once or twice and never have to worry about it again. The wind-up dboy mags you get maybe 3 to 4, 1 or 2 second bursts before you have to wind it up again."