I just put one on my Remington 870. I bought a Bushnell Trophy with the B Mount adapter for the Remington. It was around $109 from Cabelas and another $20 or so for the B mount adapter. I like it because it gives you different sight options...A small dot, large dot, crosshair (+), and a dot with a circle and another circle around it. Also has 11 brightness controls. That B mount gives you see thru mounting so if the battery on the red dot fails I can still see my bead on the end of the ventilated rib.