I next what WingedMelon claimed. I've several Holosun optics, such as this just one, and have never had a problem with any of these. I am actually selling my Trijicon RMR to acquire One more a single. The 507 is on par, if not much better, than my DPP.You can now take care of the GLOCK challenge, that's, the way in which it naturally points towards