no
It cannot use metal bb's. It will A: break the gun or B: get you arrested.
No, they are too small and will jam the gun. Never try to use metal bbs in airsoft guns or vice versa.
No, if you are talking about bb's for a BB gun. The BB's for an air rifle or BB gun wont even stay in a Magazine for an airsoft gun. Airsoft BB's are 6mm, air rifle bb's are much smaller. You will ruin an airsoft gun with the smaller metal bbs. But you can get aluminum 6mm pellets for an airsoft gun.
No it's not designed to do it.
.20 gram bbs
you can not use metal bbs in airsoft guns at all. they are not compatible because they are both built differently.
Not recommended, ever.
pellet=no bb's= 6mm plastic not copper.
The BBs made in the factory are almost flawless, making a homemade BB and using it would be very bad for your gun. One of the easiest ways to break your gun is by using bad BBs. Also do not reuse a fired BB or use .12g BBs in an airsoft gun unless it is a spring rifle or pistol. Make sure you use .12g BBs or higher. BBs are extremely cheap as they are only around $15.
it was 3'4 ft long.
never use .12 bbs. they are very inaccurate. Buy some .20 tsd tactical bbs, never use crosman