Blunderbuss

The blunderbuss was the precursor to the modern day shotgun.  Your next clue also involves projectiles.

I am small, in fact, the smallest.  Magnets don’t like me. I flow along the path with my brothers and sisters into furious battle and defeat our enemies with the death of a thousand specific cuts.  Lo, how I wish to be unique if only to go on sale for just one week.  But that will never be me, my life is to be contained until the air pushes me.

The information you seek, is next to the information.