Freedom Gorilla is easy to deal with, ships fast, has lots of tutorials and fitment articles that are a great help in choosing the right optic for your particular weapon. The Holosun 510C is perfect for a flat top/rail on any rifle you plan to shoot at relatively close range. This is going on a S&W 1854 lever action in .44 mag as a truck/bear gun. The 3 option green reticle is easy to pick up, adjusts to the ambient light, has shake awake so you can leave it on, and a solar panel that runs the reticle when there is sufficient light, thus saving the battery rated to run 50,000 hours. Would highly recommend this optic AND Freedom Gorilla, a Veteran owned company.