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Mfg Item #: O-50
The Vortex Optics Defender Flip Cap Objective 50mm features a flip cap that fits nearly all Vortex Optics and has a snap flat spring that keeps your line of sight unobstructed. It's also virtually indestructible. It has an outside diameter of 55-59 mm or 2.2 - 2.3 inches. Weighs 1.3 ounces.