The Holosun HS515GM is a compact 20 mm micro red dot sight for rifles and carbines. The housing is aluminium, and the sight is available with a red or a green reticle.
The Multi-Reticle System (MRS) offers a 2 MOA dot, a 65 MOA circle or a combination of both. Shake Awake wakes the sight instantly on motion and shuts it down when idle. The CR2032 battery is replaced from the side without removing the sight.
The included quick-detach QD mount fits Picatinny rails and gives an optical axis height of 41.4 mm (1.63", lower 1/3 co-witness).