Use this simple scope ring calculator to figure out if the scope and ring combination you’re using will clear the barrel of your rifle when fitted.

Outside Objective Diameter

Scope Cover Thickness

Ring Height


Rail to Barrel Clearance


Set to 0 if using AR-style full rail i.e. Larue OBR, DTA SRS. Also if you have a tapered barrel, add that additional height gain as well.

Clearance: mount height + ring height - (bell diameter / 2) - cover wrap = 6.50 mm (0.26 inches)PASS!