I took my CYMA CM.516 M4 (short RIS rails on the sides and bottom) out for a CQB today. Deliberately untouched from out of the box, stock 1100mAh battery , I haven't even cleaned the barrel. The only thing I did was to bin the 2-pin trickle charger that came with it and used a basic Nuprol charger.
What do you know, it did fine. Patrolbase sent it with a note saying that it had chronoed at 328 x 0.2g, and it chronoed on site at... 328 x 0.2g.
It ran off the 1100mAh all