ics cxp pistol
the plastic version is inexpensive. I run the metal version, its pretty much the same except for the motor (but I think that was only the early versions and now they both use the 3000 ics motor... i think...)
The nice thing about it, its easy to add a stock adapter ($10) if you ever want it to stop being just a AR pistol...
and no peq box needed the handguard fits a nunchuck, so lipos wont be a problem to fit in it either
I orginally bought it as a backup gun, I loved the idea of a backup that wouldnt take up as much space in a backpack... but the performance and range for such a small inner barrel led me to slap a stock on it and run it as my primary