I'd be inclined to do what Dick recommends. But if you just can't live with the initials on the gun, Ken Hurst would be my first call.
CSM is a rapidly growing company and second-hand gun-work is a very low priority to them. Their new gun sales and associated repair being top priority these days. If you were an original purchaser and your gun needed repair, you'd be less than sympathetic about a second-hand gun purchaser wanting a modification while you waited behind him. CSM is in up to its eyes in work with the new models of RBLs and their custom bespoke line. They know they can't do everything for everyone so they have to prioritize.
