With the renewed popularity of the combat shotgun, there is a recognition of the need for  good sights to engage targets at range more accurately. The golden bead that the classic hunting shotguns came stock with are fine for up close fighting and breaching shotguns, but are all but useless at range with slugs. I was pleased to see Remington put the XS ghost ring sight system on their tactical model. Not only does the Remington 870 Tactical have ghost ring sights, but it comes with a rail for attaching a sight of your choice. XS can help you put this the whole system on your gun. The XS shotgun sight kit has the rail and ghost ring sight system on their website for about $175.