The Vortex Sport Cantilever 30 Mm Ring Lower 1/3 Co-Witness provides extra rail room for rear Back Up Iron Sights (BUIS) when using the Vortex StrikeFire red dot along with the VMX-3T magnifier. The cantilever ring will move the Vortex StrikeFire forward about one inch.

Note: Provides lower 1/3 co-witness mounting height of 40 mm. Will work with most 30 mm red dot sights.


Outside Diameter



6.7oz | 189.95g approx




Model # CM-304
Brand Vortex Optics

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