Yep, it does save me a few bucks, but since my green dot doesn't fit it...It is for an optic mount. Lucky you. You don't have to get someone to machine it. Save $$$.
Well, since I don't have a compensator or suppressor, might as well leave things as they sit...It looks as if, in your pictures, the sights and barrels are mixed up with the slides. I feel as if the "high" sights should be paired with the the threaded barrel.