I bought everything to convert my usc over to a ump and emailed hdps to send in the receiver to have it milled. After sending two emails and a third for something else Im beginning to think they dont care about getting business. Or maybe he has too much, who knows. Any insight would be great. I found a machine shop that does custom work and is willing to mill the receiver and cut my barrel down, I just figured I would send my stuff to a company that specializes in this area.