Yes, it can be injured but it would probably recover. It may also attack you if it is injured. I suggest you use a pellet rifle. Preferably a .22 caliber.
Depends how hard you throw it
Yes it is.
Depending on how far away you are from the duck, you would severely injure it, probably kill it if you were close enough.
Yes and it could injure you
If its a BB Gun, Then Yes.
BB gun. Fires a round BB.
I love answering hunting questions but sadly the answer for this is no. You see a BB ball doesn't have the power to reach a vital organ. The only thing the deer will do is run away and think... Was that a Pebble? So BB balls won't do any damage,but pellets. Well pellets have the power to really injure a deer but not kill it. So my conclusion is...You can not kill a deer with a BB gun.
It's a BB Gun.
Benjamin Breckinridge Warfield did not invent the BB gun.
Which model, what is the condition of the BB gun or is it a BB rifle..
A BB gun is a gun which shoots BB-size pellets, typically with the use of compressed air, or a compressed spring.
You don't magnetize the BB's. The Magnet is inside the BB gun. The gun has to be taken apart and the magnet that holds the BB's replaced. Not all designs use this method of holding BB in place.