SP4 Side Mounted Spirit Level by Bisley
Fits all sportsmatch mounts with M5 (larger) dovetail clamp screws. Visible without having to move your eye away from the scope. It weighs only 8g so wouldn’t be noticeable.
Fits all sportsmatch mouths
Visible without having to look away from the scope
Only weighs 8g
Dispatch time 3 working days.