I've never hunted rats in total darkness, all of my ratting has been indoors in low, mixed light environments. At one dairy the rats cooperated during the day and I could actually set up on them from 30 yards. I learned to put a piece of black tape over the manometer at the front of the Atomic XR. Because it does reflect light and alert rats. Well last night I bagged two rats, but after that they were on to me. When I got home I put my "cleared" gun on the table. Set up like I was shooting and turned on the IR. From 10 yards away at certain angles I could see glimpses of red light through the "kill flash filter" of the objective. I believe as I was slowly sweeping the area from a concealed position. The rats might have been catching these glimpses of red? Advice or insights appreciated.