XM-PB4: Muti-functions grenade. We have several patents on this model. This model has 6 times more gas capacity than other grenades. You can: (Photo shows here: Click ) (1) Spread out 4 rounds 0.68" paintballs. (RED gas is the best to shoot paintballs.) (2) Easily load around 100 rounds B.B. and shoot out all at once. * (If you fill CO2, it will be extremely powerful!) (3) Smoke Grenade: Fill baby powder into it and use it as a smoke grenade. * (HOT!!!) (4) The best power source of NERF: Insert NERF into the launcher barrel and use the huge volume of gas as the power. * You need to put a piece of paper of cotton in front of the grenade.