I next what WingedMelon stated. I have a number of Holosun optics, which includes this 1, and have not had a concern with any of them. I am actually selling my Trijicon RMR for getting One more just one. The 507 is on par, Otherwise improved, than my DPP.Made my to start with buy from D4 a few weeks back, an aged Colt revolver in .32-20. I bought w