Shoot.
wait until right before the next cycle
Doubletap now - it fires your doubletap and instantly rolls into the next firing sequence, as normal.
Do this with 2 UAC/10 and you can Quad-Tap yourself.
A clan UAC will actually be firing both bursts at once if you time it close enough. The UACs have worked that way since the current double-tap mechanism was put in place.
Edited by Prosperity Park, 19 July 2016 - 04:58 PM.