I would try the new sights before ordering a stock. I have used "rifle" sights on a few different Rem. 870s. Either the factory sights on a slug barrel or aftermarket ones that clamp onto the Vent Rib. I haven't had any problems getting down and staying on them and I'm a tall/big guy. Those cantilever mounts on shotguns are excessively high, due to the mount being positioned up off of the receiver then after you add rings and a scope it's that much higher.