This gas charger is designed to store green gas / propane gas in a very compact package, which you can take with you into the field and use to recharge your gas pistols or Airsoft Innovations grenade, or Moscart shells. Manufactured in high quality materials with a heavy duty valve, these gas charger cans are extremely durable and reliable. Just fill them from the bottom and charge the can itself with your larger green gas / propane tank at base camp. Sized to fit into your magazine or grenade pouches perfectly. Made in Canada.