Mike Irwin points to the smoking gun:
......(page 48) "These NFA weapons, classified as Curios or Relics, are still subject to all the controls under the NFA. " And pre 1946 MG 42's are called.
I'll pass this to my friend and suggest his C&R license can't put him in the machine gun biz.
أنا لست ارهابيا
.50 BMG: 1 Shot 1 THRILL!