This pump shotgun vertical foregrip for ATI MB3 shotguns is folding adjustable with five positions. Forend grip mounts on any ATI MB3 shotgun equipped with a picatinny/weaver rail on forend. Shotgun grip is ergonomic and non-slip. Simply install a picatinny rail mount on your shotgun forend and your done. Constructed of heavy duty polymer for years of use. Fits on any MIL-STD-1913 picatinny rail on tactical shotguns and AR-15 rifle picatinny rail handguard. Picatinny rail sold separately. Made in USA. Limited lifetime warranty.