Can i send my Gen 3 Glock 17 to Glock to be Refinished and how much is the cost and how long does it take?

If i send it does it go to Germany or the Smyrna Georgia Factory? Does anyone know who else can Refinish My Gen 3 Glock 17 like what companies here in the U.S and that are reasonably priced?????? I just want the Original Finish it Came in which is the Black. I Just Started Carrying it Concealed in a Tagua Leather Thumbreak Holster and i know it will put wear on it over time any tips or tricks to reduce the wear from the Holster?????? I Also have a Parkerized 1911 and i would like to get it Reparkerized are there any Companies that you would recommend here in the U.S????????