.50 caliber paintball is the next generation of paintball. Its more air efficient, cheaper to play and offers lighter weight products. Planet Eclipse is the first company to come out with a .50 cal conversion kit. Now you can convert any Ego or Etek paintball gun to .50 caliber with the new conversion kit. No need to buy a new gun, just purchase this kit and you can change back and forth between .68 caliber and .50 caliber paintballs.