Any other places besides MRE and HPR doing these mods ?

 

R&D and MRE are the only shops I know of that actually do the work.

I believe HPR subs this work out to one of the above. I'm sure TVI and The Bom offer similar services.

I can't remember which I went with for the work. I'ld have to look through my old invoices, etc. I go with who The Preacher recommeds basically. The Bom can tell you who The Preacher recommends.