John Robinson. He is in Southampton, PA. just Northeast of Philadelphia. He specializes in military type firearms. I trust him with all my work. He has worked on three of my AR's, and my M1 Garand, and have received better than expected workmanship and quality everytime.
Specifically, he rethreaded my 9mm Colt barrel so that I could use a slipover flash hider that was meant for a .223. The 9mm barrels have a funny thread pitch. He has also cut down other barrels, re-crowned, and rethreaded them for me. He has also permanently attached a Phantom to a 14.5 barrel using silver solder, then refinished it a perfect match.
He is only open for drop off and pickup Thurs., Fri., and Sat., 10-5 so that he can focus on cranking the work out. His phone number is (215) 357-7381, give him a call.