I used to have one. Cost, I think, $12.95 back in the late '50s or early '60s. My dad and I used to go deer hunting in Montana, me with the Enfield and him with his scope-mounted .30-06. I always filled my license (2 deer and 1 elk, every year), and he usually managed to get 1 deer. A "friend" of mine in Alaska managed to lose it for me. Can't afford to buy another one now, but it's on my wish list. Ahead of every other rifle.