Representing the latest advancement in Night Vision optics, the ATN PS40 gives your daytime scope Night Vision capability in a matter of seconds. The ATN PS40 mounts in front of a daytime scope to enable nighttime operation. No shift of impact, no need to rezero nor change of eye relief occurs. The ATN PS40 uses the latest in image intensifier tube technology for outstanding resolution and performance. Precision optical alignment is essential for a front sight system to work properly. This is why each ATN PS40 is individually tested and aligned on an optical scale by our engineers to provide perfect alignment. The ATN PS40 is one of the most compact and lightweight NV systems in its class, at only 840 grams.