The sling adapter is a Troy setup.
http://www.skdtac.com/Troy_Professio..._p/tro.304.htm
Using the eagle pig drop slider QD attachment.
Currently trying to source one of these for the PVS-14
Of course, LaRue is a little locked down right now. I would like to be able to engage the PVS-14 without removing the rear BUIS. I was able to line up the Acog with the PVS-14, but its messy and requires you to screw around with the objective lens quite a bit.
I always have the ACOG handy, it has been my go to optic for a year now, fills every role except for NV compatibility. I have been considering switching back to the m4a1 barrel though.
I'm tempted to paint the PVS-14 (no fear) - it stands out a bit, and I dislike black void gear :P