Adjustable 8" to 10" Barrel-mounted Clamp-on Foldable Hunting Airsoft Rifle Bipod By Ade Advanced Optics SPRING-LOADED LEGS EXTEND FROM 8" to 10.5" "NON-SLIP RUBBER FEET AIRCRAFT GRADE ALUMINUM FITS ON BARRELS 11MM- 19MM. Weight: 9.7oz FOLDS UNDER BARREL WHEN NOT IN USE