I second what WingedMelon said. I've a number of Holosun optics, like this 1, and have never had an issue with any of them. I am basically selling my Trijicon RMR to have An additional one. The 507 is on par, Otherwise better, than my DPP.Exhibit total specs The AP5 Sequence, brief for "Apparatus Pistol," is often a line of roller delayed blowback … Read More