Vortex Sport 30mm Single Cantilever Ring Absolute Co-Witness - 37mm

Vortex Sport 30mm Single Cantilever Ring – Absolute Co-Witness – 37mm | CM-305

Streamline your AR setup with precision and durability. The Vortex CM-305 Sport Cantilever Ring Mount is designed for shooters who want a clean, reliable mounting solution with absolute co-witness height. At a 37mm center height, this single-ring mount aligns perfectly with standard AR-15 iron sights, allowing for a seamless transition between your optic and backup sights.

Constructed from 6061-T6 aircraft-grade aluminum, this mount delivers the strength and stability needed for demanding conditions, while maintaining a lightweight profile. The cantilever design offers additional forward offset to improve eye relief and proper scope positioning—ideal for compact and low-power optics.

Whether you're outfitting a duty rifle, competition carbine, or home defense setup, the Vortex CM-305 gives you the precision alignment and rock-solid hold you need.

Key Features:

• 30mm Tube Compatibility – Perfect for red dots and LPVOs with a 30mm body

• Absolute Co-Witness Height (37mm) – Aligns exactly with standard AR iron sights

• Cantilever Design – Moves the optic forward for better eye relief and mounting flexibility

• Durable Construction – Made from lightweight, aircraft-grade aluminum

• Picatinny/Weaver Rail Compatible – Mounts securely to standard rail systems

• Two-Screw Mounting System – Easy installation and solid zero retention

Specifications:

• Tube Size: 30mm

• Mount Height: 37mm (Absolute Co-Witness)

• Material: 6061-T6 Aluminum

• Finish: Hard-Anodized Matte Black

• Mount Type: Cantilever – Picatinny/Weaver

• Weight: Approx. 6.5 oz

• Torque Specs:

  • Ring Screws: 15 in/lbs

  • Base Screws: 25–30 in/lbs

When absolute precision matters, the Vortex CM-305 delivers rock-solid performance with a clean co-witness setup—perfect for tactical, defensive, and competitive shooting.