AA BDC Ret .50Cal unlike active IR laser pointer systems, the 550 HOLOgraphic Weapon Sight (HWS) is a passive system and emits no muzzle-side signature. While in the NV mode, the 550 HOLOgraphic Weapon Sight (HWS) not detectable by enemy night vision surveillance systems, providing operators with stealth means for effective nighttime weapon aiming.