The Energon Pub

I have a minor problem here. I stand totally in awe of the sheer awesomeness of Battle Ops Bumblebee but I have a problem with his blaster-hand:

If you straighten the blaster-arm his hand automatically switches to blaster mode. If you bend the arm back again it changes back from blaster- to hand-mode.
I am pretty sure that I saw some pics and also some videos where Bumblebee's arm is bent but he is STILL in blaster-mode.
There must be some kind of lock-panel so you can bend the arm back and still have the blaster active. I was pretty sure this panel would be the brown-coloured piece that automatically moves from left to right when you do the conversion routine. The Problem is you cannot lock it in place anywhere......

Can anyone help?