Holosun has earned a reputation for innovation when it comes to tactical sights, and the HS510C and HM3X Magnifier Combo is the perfect red dot sight combination. The Open Reflex red dot sight offers a wide viewing window with advanced technology unique to Holosun sights. Holosun's proprietary technologies are renowned for usability, and the HS510C comes with several well thought out features. Holosun's Solar Failsafe technology powers the unit by a solar panel. the sight is always charging an internal power storage cell, but it also utilizes a separate backup battery for triple power redundancy. Shake Awake technology puts the sight to sleep when no movement is detected but allows the optic to quickly jump into action at the slightest movement. Finally, the Multiple Reticle System (MRS) offers flexibility in visual perspectives. The reticle is interchangeable between a 65 MOA ring with 2 MOA dot, a ring only and a dot only depending on situational needs. A single LED projects all three reticles, so no re-zeroing is ever required. Though the HS510C mounts at an absolute co-witness as a default, this combo pack includes a bonus spacer so the HS510C can be mounted at a lower 1/3 co-witness if desired. The HM3X flip-to-the-side magnifier features a very generous 2.75" of eye relief, extremely clear glass, and an adjustable diopter for focus control. With a simple flip of the wrist, the operator can transition from no magnification to 3x power and back again. Mounting options include an integrated QD mount with an optional spacer for absolute co-witness and lower 1/3 co-witness. The HM3X housing is made of lightweight, durable aluminum and the unit is water and dust tight, with an IP67 rating.