Atkinson Firearms is now carrying the Holosun Optic line. We currently have the 507C, 510C, 403R and the 403C in stock. We will be getting some of the other models in stock so if you don't see what you are looking for please let us know and we will get it in for you. Come on in and take a look at these great Optics at a great price!!! Look forward to seeing you at Atkinson Firearms