I want the rmr to sit low enough to be able to co-witness. the optic sits higher than I would like as it it. The slide is milled for different optic mounting plates with a dove tail cut. If you milled to that level or just shy of it it would drop the optic quite a bit. I milled my Glock my self did slide cuts and a rmr cut and tap and it turned out great I can co witness and keep my grip and sight line where it is most comfortable for me. I was curious if anyone has messed with their slide?
Yes, there are services available that will mill a PPQ slide to accept an RMR. I sent two 5" slides off to L&M.....had em' milled to accept the factory adaptor plates....meaning the Shield 'low mount' plate will also fit. When using the Shield 'low mount' plate and a shield RMS, you can co-witness with your stock front sight.
If you want to co witness with a q4 or 5 u need to use the aforementioned shield sights or a deltapoint pro with rear iron attached, however I don't know if there is a front sight tall enough to make this work. The new sig romeo optics will have built in rear sights and have the dpp footprint. There are a lot of techniques people use to shoot through the body of an rmr of the dot dies as well, I think co witness irons are a bit overstated in importance but that'd be my opinion. They help a lot when you are learning but get in the way (especially when behind the optic) after you are proficient in picking up the dot.