Ultimate Arms Gear Heavy Duty 9" - 12" Tactical Low Profile Folding & Height Adjustable Aluminum Bipod For Weaver Picatinny Rail Side Mounting System Fits Rifle Sniper Bolt Action Paintball Airsoft High Tech Durable Machined Aluminum Military Quality Construction With Non Slip Rubber Feet Simple Spring Operated Leg Extender : Extends From 9" - 12" Critical Posi-Lock Feature To Prevent Tipping Folds When Not In Use And Locks In Folded Or Unfolded Position Side Mount Attaches To Any 7/8" Weaver-Picatinny Rail: Perfect For Handguards, Rifles, Airguns, Paintball, Airsoft With A Weaver-Picatinny Rail