I next what WingedMelon mentioned. I've quite a few Holosun optics, such as this one, and have not had a problem with any of them. I'm essentially selling my Trijicon RMR to have An additional a single. The 507 is on par, if not superior, than my DPP.If you might want to near the action with no loading a cartridge, just push the bolt release. It’