The PVS-14 comes with the head harness. With the right mount you can go back and forth from the rifle to the harness somewhat quickly. That harness however gets rough to wear after a while. They don't call it the "skull crusher" for nothing. It's also much more awkward to shoot with the harness as opposed to having it mounted on the rifle.
As for lasers, I'm not too keen on them with rifles. They often don't keep their zero well, and even if zeroed, they're touch-and-go at farther distances. < valley girl>Lasers are soooooo 1998< /valley girl>
With the PVS-14 behind a zeroed optic, you know that if you're seeing it you're likely hitting it.
Ya pays yer money and ya takes yer choices!
I’m nowhere near PV$-14 league.