I think I'm going to pull the optic out of my LSH and replace it with a reflector. I already have the head open, so that's no big deal. I have an IMS17, an IMS20, and a McR-18.
Which should I use? I'm partial to the McR-18, but I thought I read somewhere that it takes a little turning down to get it to fit correctly. If that's the case, I'm not interested.
Am I going to need to get some o-rings or shims or something to get any of these to fit properly?