REMINGTON 870 Integrated Pistol Grip, Upper Picatinny Rail, Buffer Tube and CBS Stock The ultimate kit to replace the factory stock, pistol grip and more. Providing better accuracy, stability and comfort. Provides top Picatinny rail for sights. Includes the #UPG47 pistol grip for ideal comfort. Our popular #CBS collapsible stock. accommodating with M4 style 6 positions buffer tube. Six ultrasonically welded metal receptacles for push button sling swivels.