I 2nd what WingedMelon reported. I've various Holosun optics, which includes this one, and have not had a problem with any of these. I am truly selling my Trijicon RMR to obtain A further 1. The 507 is on par, if not far better, than my DPP.When Auto Ordnance was selling the Thompson submachine gun within the open up market while in the ’20s, Gen