[...]I bought one of these scopes advertised to be used on shotguns, however, the first time I mounted it and shot, I lost the red dot. Sent it back and tried another, shot 5 times and it wouldn't zero. Upon inspection, I realized the entire inside tube had come loose and was flopping around inside the main tube. Once again, I sent it back and Barska sent me a non-red dot scope, but I'd lost all confidence in their products, so I sold it. For a dependable red-dot scope....keep looking, spend a little more money, and find one that will withstand the recoil.