Projects from rear onto a screen so red dot moves when you move your head. With the clamp and set screw tight the top of the unit has so much movement that you can move the dot completely off a 1 meter target at 50 meter distance. Also BSA wants you to sent them a $10 shipping fee so they can tell you that their product is a pos. Save your money and put it toward a quality optic.
Pros: wide field of view for easy target aquirement
Cons: does not stay sighted in.
This review was written in the old system and had content requirements that are different than reviews written today.