You dont always get what you pay for - X-Vision MAAG 3x Red Dot Magnifier MG1

This thing sucks. The mount doesnt securely fasten to any rail without flopping around. You can adjust the swing tension on the optic itself with a set screw on the bottom, but that does nothing if the whole thing is flippin and floppin all over the place. Even on sale or clearance i wouldnt sell this pos to my worst enemy for $100. Dont cheap out, get something thats worth having.