581 M.18 spirit level – radially adjustable

• M.18 medium-to-slow bubble that runs through twin markers
• Screws into the front sight 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 the need for more tools
• Laser engraved degrees marked for reference