I have a bushy m4 a2 with a arms 51c. I have a aimpoint mounted on the sir in front of the carry handle. I would like to know if there is any night vision device I could get to mount some were on my gun to be use with my aimpoint.  

Is your Aimpoint NVG compatable?

they make 2 different versions (1 with, 1 w/o)

yes it is night vision capable

dont anyone have a solution?

depends on your budget. I have a PVS-14 monocular that I use on a head mount over my left eye. If you're looking for something to mount directly to the weapon itself, the 14 is the way to go, but you'll need a adaptor block to bring the Night Vision up to the same height as the Aimpoint. You're looking at a very very very very spendy outfit. The GG&G mount for ours cost $200 alone. If you're looking for something for Night Vision, you're gonna spend for it for anything that works at all.

No there is not.  You need a flat top.  Id suggest an IR laser anyway.

how would a head mount monocular work? would it hit the back of the carry handle when you shouldered the gun with nose to charge handle.

Noone but me actually read your post and they are speaking of a flat top.  You cant do it and its a bad idea anyway.  Go head mounted and get a laser.