Just picked up a slightly used 23 for 250. Figured I couldnt go wrong with the price. How ever I dont shoot 40. I want to convert this into a 19. Do I need to change out the locking block and extractor, Or can I just swap the barrel out and call it a day? Ive looked at the conversion barrels from blacklist and after I saw how the coating performed on just 7 rounds out of my brothers 43 I dont think I want one. Who else makes barrels? Im also looking to do an RMR and some stippling. Any recommendations on stippling? Im pretty set on having Loki Tactical do the slide work. Their stuff looks great. Thanks for the responses.