I believe that Galco makes some leather 1911 holsters for optic ready models that has a patented device for carrying cocked and locked, to prevent ND's.
Delta Point for sure, but I've also had good luck with my Holosun 507k. While I haven't heard anything problematic about the CT personally, I don't know that I would trust it. I've shot some guns with them and they appear to be a little cheaply made - but that's solely an opinion, and is not...