Looking to try a Holosun 507c on a Glock 19 gen 4. Found a place called jaegerworks that offers a deal on the sight and milling for $350. and will nitride for another $50. Thoughts? The dimensions are the same as rmr, so I could use it as well. I think the specific cut without the adapter plate of the mos guns seems better/stronger, but don't have any experience with these. Also curious if the refinish is done only to the cut area, or if you have to do the entire slide. Any comments/feedback would be appreciated, including the sight choice. Thanks!