Instead of relying on chemical propellants -- such as gunpowder -- a rail gun uses magnetic "rails" to launch a solid, nonexplosive projectile at incredible speed. Theoretically, rail guns would be able to precisely strike targets at extreme ranges, and would negate the risks associated with carrying around tons of explosive ammo.
For those who find the Maglight doesn't provide enough bad for your ass, you could try the flashlight that burns things.
The Torch is the world's brightest and most powerful flashlight. It is capable of melting plastic, lighting paper on fire within seconds, and if you like, fry an egg or a marshmallow on a stick.
Oh, and Apple stock is dangerous.