I'd like to vouch for Red62. He's an excellent gun doctor. And if there are things that are broken that there aren't replacements for, he makes a custom piece to replace it, and it works! He's a nice guy and very well respected.
HK Ares SL8-1 // Javelin M24 // ICS M4S // Socom Novak NeXt Two-tone 1911 // WE Glock 17