A concept weapon I've been working on, with the guiding philosophy of 'screw realism, go for looks and wrap it with cyberpunk technobabble.' That said, I actually built the grip in clay before I modeled it, so it works - honest!
By the by, I was going for that 'moral-gray-zone government paramilitary unit' (i.e. Shirow Masamune) look, so if you get that impression I've succeeded.
Falkenhayn Schram FsW-24-J submachine gun. Caliber 6.2x25 mm, gas operated rotating bolt with a proprietary 'ArcMag' system (basically a P90-esque magazine with the bullets staggered in an arch pattern) to streamline the weapon and keep it compact. Combined with a single-point sling, the weapon can be concealed under a loose jacket or even inside a sports bag.
The weapon is 648 mm long and 204 mm high, smaller than the popular MP5 by a good inch or so. The barrel length, on the other hand, is a whopping 333 mm - one and a half times longer than the MP5A2. The ArcMag holds 40 rounds. Other features include a detachable STANAG rail, ambidextrous controls (can be field-stripped and switched over), a suppressor, a two-mode sight with options for 50 and 100 yards, and a light-fiber front sight.
As for the innards, the Tecpatl ('obsidian knife') has more in common with Eastern products like the Russian 9A-91 than any Western firearm, owing mostly to its East European design team. Fire rate is a modest and controllable 750 rounds per minute. The 6.2mm Rodega cartridge - developed from the Swedish CBJ - balances stopping power with armor penetration capabilities for desirable ballistics in urban conditions. The recoil is very light, and the weapon is reportedly very controllable even on full-auto.
Falkenhayn Schram is © me 2012, I guess.