NBS 30mm Bubble Level Riflescope Tubes

NBS 30mm Bubble Level Riflescope Tubes It is easy to install and to mount anywhere on scope tube left or right side, the ring is so light to carry and cannot block you view of hunting. Makes it easy to maintain a perfect horizontal hold during extreme-range shooting. And matte finish, which reduce glare so that you position can be camouflaged at all times. Viscous fluid: No matter what circumstance, it always exists one bubble.