Miaozhun 2 Pack Tactical 1 inch and 30mm Scope Mount Ring Adaptor with 4 Slots Picatinny Rail, Shotgun Barrel Clamp with Diameter Reducer Insert for Flashlight Laser Sight - US-Y0039-2

• Barrel/scope clamp ring with picatinny rail top and adapter reducer spacer shim, fits 1 inch and 30mm scope/barrel. 4 slots 20mm standard picatinny weaver rail on top for laser sight,red dot or flashlight. 2 clamp screw on each side to ensure the mount more secure. Made of high strength aircraft aluminum alloy,solid and sturdy,item size: 1.77"L x 1.72''W x 1.70''H, item weight:1.38Oz/1 pcs. If it's still loose after installation, you can try wrapping several layers of electrical tape around the tube. This should resolve the issue and prevent scratching the tube at the same time.