An expose of the fiddly bits of the Castle's Vulcan Arms V10-45, seen earlier this week, here.

Here he is, field stripped to his basics.

Slighty higher-res version here (that better, Brab?)

Looking deep into his guts, a look at the fiddly bits of the lower receiver.

The upper receiver and bolt assembly. There is a nylon buffer there, to keep the bolt from slapping the rear of the receiver.

Really, in concept, there is little to distinguish this design from the M3 grease gun, the major differences being the Grease Gun is tubular, and the V10's bolt wraps about the barrel at the breech (shown open here), saving overall length in the same manner the Uzi does.

But it's a bit clunky for a pistol. Vulcan does make a carbine version, but that didn't interest me. I'd get a 9mm version for SWWBO, except she thinks they're ugly, and wants something prettier.