Yes they are. I have a friend that used them and you can find them in some stores in USA
Air Soft guns. Yes
No because they have run out of fuse or power. However, ther are some highly expensive airsoft grenades that cost like $250 and are reusable.
No.
YES
No. it is not.
YES my friends and i play air soft all the time and there is actually placess designated for air soft wars just like in paintball
yes
I don't know about Canadian airsoft stores, but I know that most airsoft in North America sell Canadian-legal airsoft guns.
You local police can tell you.
no any kind of gun is illegal there
Rocket propelled grenades
rocket propelled grenades