so you win the lottery and go crazy buying night vision set ups. here is what you have bought;

4x raptor NV scope
PVS 14 with weapons mount & head mount
PAQ 4C

assume you have 2 AR15's with flat tops, would you put all this stuff on one rifle or would you split it up and have 2 rifles NV ready?

I would leave the PAC-4C on one rifle all the time and the Raptor on the other all the time.  If I could get a small and lighter PVS17 then I would keep it handy to put on the IR laser equiped rifle at night and attach it permanantly to neither.  Hell If I won the lottery Id have 2 PEQ-2s 2 PVS-18s and a PVS 17 with a Raptor set up for a bolt gun and one of those new mini thermal imaging sights...