Refillable CO2 cylinders galore!  We've got them of all sizes and shapes to fit all and any paintball marker.  These will fit your scenario tactical paintball gun as well as your competition tournament marker.  Pick the right size and shape to fit your activity level and how heavy you want it to be; the larger ones are a bit bulkier but of course they hold more air and will give you more shots.  Feel free to browse, if you can't find it, email us at: questions@choicepaintballguns.com.