Ultimate Arms Gear Chainsaw Zombie Killer Breacher Handle Hip Shooting Fits For Remington 870/11-87/1187 12/20 Gauge Shotgun Weaver Picatinny Accessory Mount System Chainsaw Will Fit Any Weaver Picatinny System. Intended To Be Fired From The Hip, This Top Handle Allows The User To Cycle The Action While Simultaneously Maintaining Leverage Above The Gun To Help Tame Muzzle Flip. Molded Of Sturdy Reinforced High Grade Black Colored Polymer. Easy Installation - No Gunsmithing Required - Secure Chainsaw with Allen Key Onto Weaver Picatinny System ! Provides A Great Edge And Natural Fighting Stance Hold To Enhance Accuracy And Control.