I 2nd what WingedMelon mentioned. I've a number of Holosun optics, including this a person, and have not had a concern with any of these. I am truly selling my Trijicon RMR to receive An additional 1. The 507 is on par, if not greater, than my DPP.Present entire specs The AP5 Sequence, shorter for "Equipment Pistol," can be a line of roller delayed