Awwww.
Alright then. One big thing for the future: Caseless ammunition, get rid of shell ejection.
Oh yeah, that's a very nice futurism, and you guys did explore that, albeit you know... with wood, which kind of doomed itself to be scrapped to the "let's revisit again a century from now"-shelf
Edit: Oh man, this is ugly
Flippable barrel for kewlz/helps click in place magazine (a reach, I know, I blame you Crni, I really liked the look of the barrel that flips)
Area marked
? has mechanism that turns bullet right way (G11 and P90 do similar magic trickxs)
Caseless ammo makes for more efficient magazine - either smaller mag with cute ammount of bullets - or more room for for more bullets.
Also, bullets could fit better if designed to be "hand-rifle"-like, as in FN 5.7
Grip more revolverized, could slim it down even more, for a more exotic wtf-esque look
Bullet does not need firing pin, or any such mechanism, since the projectile is encased in solid propellant that'll blaze up for then to disintegrate. Ignition could then be provided from some discrete mechanism below, directly connected with the trigger