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This sight is designed to fit airsoft rail systems, I cannot guarantee that it will fit it's real steel counterparts. This sight is intended to be used on the top rail for a Right-handed shooter, though a left-handed shooter could use this on a side rail as well.
This product allows for speedy target acquisition in close quarters alongside giving the player more options when approaching a corner making "Slicing the Pie" less of a risk. For low light applications, it would be advised to paint the rear sight ring white on the operator's side.