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If you look at the last row there is a 1-inch barrel which got around 730fps. So this one could reach 700fps I reckon (enough to go through a patched leather jacket quite easily).

BBTI -...

Yeah, I'm an English teacher not a mathmatics teacher for a reason :D

I enlarged the picture to standard size and the barrel from the end of the chamber to the end of the muzzle is 150mm or 1 1/2cm - easy to see this guy in the dark...just follow the muzzle flashes.

Looks like he made the pistol grip out of Selleys Knead It Steel - an epoxy putty that sets like metal.

It's great stuff, I highly recommend it ....just not for illegally 'modifying firearms'.