Uband Adjustable Metal Rizer V2 Hop Up 16mm. Features: - The uband rizer v2 hop up is a rebrand hopup on the alloy rizer r1 v2 hop up. - Made on alloy for greater strength. - Will increase accuracy and distance of your gel blaster. - Adjustable via grub screw. - Fit with 9.5mm size inner barrel . - Outer size of the hopup is 16mm so make sure the inner diameter of your outer barrel is larger than that . - To reach the best performance,you need insert this hopup into the barrel 10mm roughly . Specifications: Brand: uband. Material: alloy. Outer dia: 16mm. Length: 45.8mm. Color: red; yellow. Package includes: 1x rizer v2 hop up . Rizer Hop Up installation Video