Intro: K'Nex PSG-1
Okay, this is it. I know barrax already did one, and his was pretty good! So, I did my own! Here it is, pictures, as promised. ; )
UPDATE: Don't get too excited about instructions on the 20th. Also, I modded this to fire a Nerf dart shell round about 30 feet.
UP-UPDATE!: the-ruler-of-craziness posted it! This is it.