I next what WingedMelon reported. I have quite a few Holosun optics, which includes this one, and have never had an issue with any of these. I'm truly selling my Trijicon RMR to have A further just one. The 507 is on par, if not superior, than my DPP.Now you can take care of the GLOCK situation, that may be, the way in which it naturally details to