I next what WingedMelon claimed. I have quite a few Holosun optics, which includes this just one, and have not experienced an issue with any of them. I'm truly selling my Trijicon RMR for getting An additional 1. The 507 is on par, Otherwise greater, than my DPP.Created my to start with order from D4 a couple months in the past, an old Colt revolve