Night Optics PVS-27 Clip-On Magnum Universal Night Sight NS-P27-3AGM is a high powered, highly efficient accessory for converting your favorite day time rifle scope into a high-resolution night vision scope without dismounting it from your rifle. These Night Optics night vision sights mount easily to any Weaver rail with its included mount. You'll never have to worry about the night vision sight misaligning once it's attached, since it requires no boresighting and always stays true to zero. The NightOptic PVS27 Gen 3 Magnum Night Sight can be mounted on any rifle scope from 1x to 20x, and you'll experience no loss in resolution even at maximum magnification. The Generation 3 night vision tubes on these night sights feature an auto-gated power supply that creates a crisp, consistent night vision image no matter what scope you're using. These night vision rifle scopes also have manual gain adjustment, so you can tailor the sight to your immediate surroundings on the fly. Slightly larger and more sturdy than its PVS-22 counterpart, Night Optics has equipped the PVS-27 with a proprietary Shock Mitigation System that allows it to dismiss recoil from weapons up to and including .50 caliber bolt action sniper rifles. Built for medium to long range carbines, rifles, and machine guns, the NightOptic PVS 27 Gen 3 Magnum Gated Night Sight is a versatile, high resolution night vision adapter for all your tactical, law enforcement, and nighttime hunting needs.