It looks like a production piece, but found no links to buy one.
Were it under $100, I think I would, just to be the first kid on the block.
But I do sense some confusion between coilguns and railguns
Coil guns are coils of wire like an electromagnet or selonoid. Current passes through the coils making a dougnut or toriod of magnetic force that sucks a ferrous projectile down the center. A row of them staged to fire at the proper timing can be used to increase the velocity.
Coil gun pros: Not very dangerous from arcing or heat, does not damage itself when fired, no contact or friction with the projectile.
Coil gun cons: Coil timing for efficient launch is difficult, coil guns capable of enough velocity are very heavy and bulky. (until cheap, room tempature, and lightweight superconductors are invented at least)
Rail guns are made by two charged conductive rails with a projectile causing a short that's propelled along the rails.
If you see those antennas in "mad scientist" or Frankenstien movies with the "Jacobs Ladder", the wedge shaped lightning bolt repeatedly flying up between the arms, imagine it enclosed, firing faster, and propelling a projectile, that's a railgun.
Rail gun pros: Higher velocity, more compact than a coilgun. (in the "barrel" part at least, not the power supply) A wider variety of non-ferrous projectiles are possible (Depleted uranium etc.) as long as the contact bridge at the base of the projectile is conductive.
Rail gun cons: Unacceptable wear on the rails. (They vaporize a bit every shot), dangerous arcing and heat. Sometimes they explode.