The RAM11S that is a MP5 style .43 caliber marker which shoots a .43 caliber rubberball or paintball. RAM takes realistic scenario gaming to the next level by being almost exact in weight, function, and appearance to a real firearm. Military and law enforcement are currently using RAM for close quarter combat training all over the world.
Please check out the lYOUTUBE video link below which is a 13S that is the collapsable stock version of the 11S.
The Umarex Usa MP5 RAM11S style marker is older, so while it may be available used and in a few cases new, it is not commonly available anymore.