A
coil gun doesn't seem to meet the definition of a firearm per
CA law, nor does it meet the definition of a firearm per federal
law. Therefore, it is not a "
gun", legally. ... It's a magnetic "
gun" that uses electromagnets and pulsed electricity to fire a projectile.
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It's probably the danger; between the charge stored in banks of capacitors and the flying projectiles, big coil guns can be lethal to experiment with.