Depends on your skills, size and parents.
If its a BB Gun, Then Yes.
It all depends on your parents, the country and location where you live.
You have to be 18 to purchase a BB gun but you can use one under adult supervision or guidance at any age as long as you act mature and understand the basic safety rules of handling a BB gun or Rifle
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.
A BB gun is a gun which shoots BB-size pellets, typically with the use of compressed air, or a compressed spring.
In order to be used the Caliber must be .175 or it will jam or damage the gun. BB stands for "Ball Bearing". Never use a BB in a Pellet only gun.
I use a Daisy Red Ryder BB Gun.
It may cause problems with jamming. It is not recommended.
In mst cases, no, it is not- but it will depend on where your garden is located, and what you are doing with the BB gun.
Your parents will decide.
21
No it's not designed to do it.