Primary Arms PLx Top Cap Reflex Mount 30mm Black. Designed specifically for use with the 30mm PLx scope mounts this top-cap reflex mount allows you to easily mount your Primary Arms 24mm mini reflex sight at the 12 Oclock position above your scope for fast transitions from medium range to close quarters. When used on the 30mm PLx 1.5in mounts it will place the base of your red dot sight at the 2.04in height allowing you to simply raise your head to use the sight. This red dot mount features a footprint for use with the Primary Arms Classic Series 24mm Mini Reflex Sight or any other RMR footprint optic. Specifications for Primary Arms PLx Top Cap Reflex Mount: Manufacturer: Primary Arms Color: Black Finish: Hardcoat Anodized Fabric/Material: Aluminum Tube Diameter: 30 mm Height: 2.04 in Condition: New Package Contents: Primary Arms PLx Top Cap Reflex Mount Primary Arms 910109: PLx Top Cap Reflex Mount 30mm Black