Mount an Aimpoint ACRO* to your Remington 870. This mount is as low as possible to work with traditional or pistol grip stocks; most shooters will not need a riser.
Gunsmithing is required for installation! Installation will require drilling and tapping two 8-32 holes in your shotgun receiver.
WORKs WITH FACTORY HOLES/SPACING IF YOUR 870 HAS THEM
NOT compatible with 20 gauge 870s, 7615, 7600, etc.
We do not know how will it cowitnesses with various iron sights. We have only used it as a stand alone optics mount.
*and other compatible sights like the Steiner MPS and Lead & Steel Pandora