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Yes. You're also of legal age and then some to buy a real gun.
Yes
Yes. You may shoot a BB gun as long as you do it safely and sensibly.
Arguably no, since you can only torture a possum with a BB gun, not kill it.
no
BB's are round and are .175 caliber. Pellets are not round and come in different shapes and sizes. If the gun or rifle is legal then the BB's and pellets are legal.
18 to purchase
If it was illegal to discharge a BB gun then they wouldn't make BB guns. So the question is, Where is it legal to discharge a BB gun? Every state, city or country has different laws about BB guns so it is best to check with local law enforcement or city ordnance's to find out about where you want to shoot.
Most good sporting good stores carry them. You can also find them on the web, just search for "BB GUN "
Sorry but no. Authorities can arrest you and also confiscate your BB Gun.
no not if your are taking a plane
Yes, if you follow the laws