Originally Posted by Gunk
I wouldn't go more than a 45 degree angle, and even then only when I'm peeking out of a corner.
But I'm interested in seeing a video of someone trying to fire a GBB upside down... try it out.
They sort of just spray gas out the ejection port (and from piston head/loading nozzle area, if your piston head is stock-ish), hop-DOWN, and freeze up your internals. Nothing special there.
It's a pistol, you shouldn't have to be rotating your short/tiny little gun to be doing special maneuvers, no?