Not really being a weapons expert, I can only give my opinion from a conceptual point of view on the AN/PVS-22 Universal Night Sight. This is the first of it's kind of sighting system that actually allows the use of the magnification abilites of the day scope sitting directly behind the system, rather than infront of it, like most other existing systems. The PVS-22 enables the user to not have to adjust the day scope to the night vision, but rather adjust the night vision to the day scope. At higher magnifications, one wonders how well it can perform, at say 10x or above. The trick is the night vision needs ambient light. Having the night vision sit infront of the day scope allows the objective lens of the PVS-22 to absorb more ambient light and provide better image quality at high magnifications. This is certainly an advantage over having the night vision behind the day scope and snug up to the eye lens where it can't really absorb much stray light.

Conceptually, the PVS-22 makes a lot of sense, but without having tried it out, I can't be certain.

For more information try googling "PVS-22". There's a few sites that carry them, or just click the link here: Google: PVS-22