How do you make a laser gun in minecraft?

Answer 1

You know, I'd love a laser gun.

Made like this:

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Yes, an obsidian handle.

Anyway, it'd shoot lazors obviously, and the lazors would pierce through 10 layers of blocks in a 3x3 size, and when it hits an enemy, THEY DIE INSTANTLY, GET VAPORIZED, AND NO ITEMS WILL DROP!

Seriously, I'd love it.

and yes, it uses IRON ORE and IRON INGOTS, lol.

EDIT: it should also use 303's modloader.

EDIT2: and inf uses