Gunsmithing Who is your go to for dlc bolt coating

Problem with the guys that advertise this service do NOT do it in house. They send it out. The people who do it aren't gonna do a hand full of parts so they do them in batches. Hundreds of small parts to the batch. If you get your order in at the tail end filling the batch you might do alright time wise. If you get in on the frontend of putting the batch together you might wait months. There also have been horror stories told about not getting the same parts they sent back. Not saying any of the shops mentioned above are guilty of anything.