REMINGTON 870 Integrated Pistol Grip and Upper Picatinny Rail It is possible to upgrade your Remington 870 with a flat butt shape and Picatinny rail. Provides top Picatinny rail for sights. Two ultrasonically welded metal receptacles for push button sling swivels. Includes the #UPG47 pistol grip for ideal comfort. Optional to add telescopic buttstock.