Vortex VMX-3T Magnifier w/ flip mount

Simple, fast, effective—the push-button design of the VMX-3T engages and disengages the flip-mount, allowing the magnifier to lock in place. The result, 3x magnified or unmagnified views at will. Optics are fully multi-coated for optimal light transmission. Lightweight and tough; hard-coat-anodized machined-aluminum construction ensures durability. Internally nitrogen purged for reliable waterproof/fogproof performance. Ultimate magnified versatility for virtually any AR-height red dot sight.
Note: Allows for lower 1/3 or absolute co-witness mounting heights and is ideal for shooters who want to increase the effective range of their red dot sight.
Features:

Fully Multi-Coated Lenses: Increase light transmission with multiple anti-reflective coatings on all air-to-glass surfaces.
Waterproof:O-ring seals prevent moisture, dust, and debris from getting inside the tube for reliable performance in all environments.
Fogproof: Barrels are filled with nitrogen gas to inhibit internal fogging.
Matte Black Finish: Hard-coat anodized for durability.

Specs:

Magnification: 1-3 x
Eye Relief: 3.25 inches
Field of View:38.2 feet/100 yards
Tube Size: 30 mm
Length: 4.3 inches
Weight: 11.9 oz