ATN Day/Night weapon systems, for those who are looking for the best day/night vision rifle scopes. The Day/Night weapon sight is ideal rifle scope for Hunter, Military Marksman and Law Enforcement sniper. The latest advancement in Night Vision optics - the ATN PS22 gives your daytime tactical scope or spotting scope Night Vision capability in a matter of seconds. The ATN PS-22 mounts in front of a daytime scope to provide it with night time operation. No shift of impact, no need to re-zero or change in eye relief occurs.The PS22 night vision front sight mounts directly in front of your daytime scope quickly and securely without tools; making it Night Vision operational. With your daytime scope already zeroed, the PS22 requires no further zeroing and allows you full use of all the features of your daytime scope.