Not normal ones but at your local sporting goods store there should be some if not no.
most are not but biodegradable bbs can be purchased. However these bbs are flawed in that they shatter on impact
no biodegradable means they turn into compost in a few years
Airsoft weapons do not fire real ammunition.
Yes.
I would highly recommend that you do not make your own airsoft pellets. They might jam and or brake your gun.
In the magazine.
30-45.
Most airsoft guns have magazines that you put bbs into just like you put real bullets into a real gun's magazine
first by, telling them they are not real bullets, and you wont point at anyone in the face
I know at Academy Sports you have to be 18 years or older.
No they are Copper, Lead or Steel ball bearings. airsoft uses 6mm plastic BB
Yes, every airsoft gun can fire any gram of BB, although .12g BBs wont be that effective in a sniper, try .25g or even .3g.
The bullets used in an Airsoft gun are BB's but an owner should make sure that pay attention.to the quality of BB's that they buy. If they are sure to buy the best BB's the gearbox components will be damaged and cause the owner to spend far more cash over the long haul.