Ultimate Arms Gear Chainsaw Grip Chainsaw Grip Will Fit Any Weaver Picatinny Rail System On Your Forend. Chainsaw Grip Is 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 Tactical Black Colored Polymer. Easy Installation - No Gunsmithing Required - Secure Chainsaw Grip with Allen Key Onto Weaver Picatinny Rail ! Provides A Great Tactical Edge And Natural Fighting Stance Hold To Enhance Accuracy And Control. Compatible with Mossberg 500 / 590 / 835 / Maverick 88 12 / 20 Gauge Shotgun Weaver Picatinny Quad Tri Single Rail System