I second what WingedMelon claimed. I've a number of Holosun optics, together with this a single, and have never had a concern with any of these. I'm really selling my Trijicon RMR for getting another a single. The 507 is on par, if not greater, than my DPP.Now you can correct the GLOCK challenge, that is certainly, the best way it Obviously details… Read More