Holosun

HS515BU is a red dot sight that features the circle dot reticle with the option of switching to a 2MOA dot only. B signifies that the battery is in an internal tray accessed through the side of the optic with a removable tray. U signifies a housing design that shrouds the windage and elevation turrets on two sides. Employing new LED technology the life time for one CR2032 battery can reach 2 years if left on constantly. However the motion based automatic on and off feature extends the battery life dramatically beyond that for the average shooter. Includes flip-up lens covers a kill flash filter and a quick release mount. - Features - Motion based automatic on & off - Parallax free with unlimited eye relief. - Switch between circle dot and red dot reticles. - Kill flash included. - Battery tray. - Flip-up lens covers won't obstruct your vision. - 1/3 Co-witness QR mount included - Quick release mount. Adaptable to Picatinny or Weaver rails. - CNC machining with T6061-T6 aluminum housing.