HD104  Reflex Red Dot Sight.  This reflex optic offers outstanding versatility and precise aiming, featuring four selectable reticle patterns to suit all shooting scenarios. It perfectly aligns with your firearm’s iron sights for full co-witness capability. Dual digital switches provide five adjustable brightness settings, keeping the reticle sharp and visible under all lighting conditions. Compatible with all firearms equipped with standard Picatinny or Weaver rails, its fully sealed, impact-resistant housing delivers stable, durable performance for all outdoor shooting activities.