ATN Day/Night weapon systems, (ATN PS22 and PS40) 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 and PS 40 give 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 ATN PS22 or ATN PS40 night vision front sights mount 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 or PS40 require no further zeroing and allows you full use of all the features of your daytime scope.