push.
Still annoying guys...

Currently on 1.64 RC Branch - Virtual Arsenal, AK-12, no Mods enabled.
Missalignement is very clear with the AK-12 - however, if the ERCO is mounted, the crosshair of ERCO is on point, not the ironsight of the AK-12.

I got a video where the target is 200m away - you can see the bullet hit on the right sideof the reticle.
I used a SPAR 16 and Bipod - all MODS disabled.
I cannot upload the video, so here is a link to DB https://www.dropbox.com/s/ebruv0blz9aerrr/ERCO_misaligned.zip?dl=0

I just tested it again with disabling all mods - it seems it has something to do with one of them.
Withouth mods enabled, it works!

Ok - I tell you exactly what I did:

1. Open Editor and select a island
2. Place a UAV Operator and a Hummingbird (works with other helicopters as well)
3. To create the UAV use the following example below of the command: https://community.bistudio.com/wiki/createVehicleCrew

(I used as UAV: B_UAV_02_CAS_F). You can also place a UAV and hack it on the spot and let it take off - works as well

4. Connect to UAV and tell it to loiter
5. Connect to UAV turret and lock on to your position
6. Get in the helicopters pilot seat and open the turret again
7. Watch you bounce and how the helicopter explodes

Note that the advanced flight model is enabled (all options set to enabled)

Video on youtube is here: http://www.youtube.com/watch?v=NfAtAWjJIkU

Hope this helps.