Vector Optics | Bubble Level | Spirit Level | 21mm | Weaver

Vector Optics Bubble Level – anti-cant level for 21mm rails

The Vector Optics Bubble Level is a rail-mounted anti-cant indicator designed to keep your scope horizontally aligned. It mounts to a Weaver rail and weighs only 10 grams, making it a compact addition to any optic setup. A green liquid-filled vial provides immediate visual feedback on tilt.

Construction and materials

The housing is made from aluminium, providing a durable structure without adding significant weight. The unit measures 51mm in length and weighs 10 grams. A matte black finish reduces reflections and visually matches most optics. The bubble vial is positioned on the side for easy reading from the shooting position.

Application and use

This bubble level is used to eliminate cant errors during aiming, where even a few degrees of tilt affect the point of impact at longer distances. It is suited to precision and long-range shooting, as well as airsoft and air rifle setups. The side-mounted vial allows you to check alignment without turning your head.

Integration and compatibility

The level mounts on a Weaver or Picatinny rail, the standard on airsoft replicas and many PCP air rifles. A screw clamp secures it firmly in the desired position beside or in front of your scope. No adapters are required, and an Allen key is included for installation. This is a standalone accessory and must be combined with an existing optic.

Maintenance and lifecycle

The unit requires minimal maintenance. Occasional cleaning of the vial keeps the bubble clearly visible, and the screw clamp can be retightened as needed to maintain a secure fit.