The HE503R-GD (Gold Dot) is a 20mm micro sight designed for rifle and carbine applications. HE503R-GD features a Rotary switch to select reticle intensity, Holosuns Gold Super LED with 50k hour battery life, and MRS (Multi-Reticle System) with 10 daylight and 2 night vision compatible reticle intensity settings.The HE503R-GD housing is made from 6061 aluminum and includes both a lower 1/3 co-witness mount (1.63) and a low mount (.75) for low-comb height rifle applications. Additional features include Shake Awake technology, rubber lens covers, and a battery compartment integrated into the Rotary switch for the 2032 battery. HE503R-GD is a versatile sight for users of all levels.