Dust Cover for Holosun 509T with Battery Compartment Color:Gray - Extremely Compatible: Works with

- Extremely Compatible: Works with any KeyMod rail

- Audible Latching Click: Belt latches onto the hanger with a satisfying and confident "click"

or any other firearm with a carbine buffer tube

4" in diameter

62x39 mags with a wider baseplate than the mag body

Dust Cover for Holosun 509T with Battery Compartment Color:Gray - Extremely Compatible: Works withFriction Fit: Cover slides onto Holosun 509T X2 red dot and holds a CR1632 battery in the top of the case via a friction fit. Battery not included. Simple Install and Removal: Firmly press down to install. To remove, firmly push up, alternating between pushing on the front and back half, to walk the cover up and off. Slide Mounted and Non Slide Mounted Versions: If you are using this on a pistol where the sight is attached to the slide, choose the