Vortex Optics Sport 30mm Single Cantilever Ring Lower 1/3 Co-Witness - 40mm CM-304

The Vortex Cantilever 30 mm Single Ring delivers more rail room for rear Back Up Iron Sights when used with the VMX-3T magnifier and the StrikeFire red dot sight. This single ring can provide a lower 1/3 co-witness mounting height of 40mm and works with most 30mm red dot sights. Will also move StrikeFire forward about one inch.