I had a cheap mueller quickshot scope on my 12 gauge and 20 gauge a few years ago. It seemed that after I got it sighted in it was always losing its aim point after a few shots. I was always messing with it to get it shooting on target again. I finally gave up and bought a burris fastfire 3. What a difference all around. I wish I had saved the 99 bucks if the first place and just bought the burris.