hmm ! Airsoft Innovation is work pretty well in any situation that you prefer you want to use but actually it won't work much in out door game especially in winter.
Since this grenade has been made in Canada so basically you don't need to have license to import it so that mean, you can get it easily. For other grenade, it would be stop at the border so don't risk your money to get it oversea.
Try to search AI tornado on the forum, there are a lots of review about it from lots of people. Hope it help.