The HS510C Reflex Sight has an open frame for a wide sight picture. Always on, it is powered by solar cell under normal usage, and a back-up battery to supplement power requirements in low light conditions. The reticle can be switched between a 65 MOA circle with 2 MOA dot, or a 2 MOA dot only at the push of a button. Better yet, the same LED projects both reticles, so no re-zeroing is necessary. 

Features

When focusing on the target, the size of the reticle will change based on the distance between your eyes and objective lens
Parallax free optical design, with unlimited eye relief
Minimized obstruction of vision with push button controls and a streamlined housing design
Switchable circle/dot and red dot reticles
Always on unless manually turned off
Solar cell and high capacity battery provide dual power supplies
Absolute cowitness QD mount