HD104 Quick Detachable Reflex Red Dot Optic.  This reflex optic delivers great adaptability and pinpoint accuracy with four interchangeable reticles for all shooting tasks. Its quick-detach base mounts effortlessly and supports full co-witness alignment with your firearm’s iron sights. Two digital switches control five brightness levels, delivering clear reticle visibility in every light condition. Fitting all guns with Picatinny or Weaver rails, this fully sealed, impact-resistant housing ensures steady, long-lasting performance in any outdoor shooting environment.