How about we use a ferritic material that has been permanently
magnetized. Then we can line the pipes with supercooled electro-
magnets to keep the magnetized BB's orientated in the correct
manner.
And when the boys in congress get some silly idea in thier heads,
we can pull the end off of some of the pipes into the DC area and
have a few .17 caliber rail guns on our hands.....
Chris