581 M.18 spirit level - radially adjustable
M.18 medium-to-slow bubble that runs through twin markers
Screws into the foresight and is held in place by a lock-collar - a C-spanner is provided to lock it in position
Once in your position on the rifle whatever angle of cant you normally use can be set by simply rotating the whole bubble on its ratchet system
A friction collar holds your setting without need of more tools
Laser engraved degrees marked for reference
Color: black
