I saw a similar ad in a local "Penny Saver" type publication. I had the same questions as everyone else here. Don't see how a gunsmith could make ANY money on the deal, espcially since the ad I saw quoted a price as low as $300 EACH. Here's the ad:
"Cusotm built mauser rifles for sale, all calibers. If I don't have what you want in less than 2 weeks I can build it. Calibers 25.06, 30-06, 257 Roberts, 22.250, 300 Winchester short mag. Mausers-all for $300 each, any caliber, individual $350.(318) 461-5529, (318) 933-8222"
Who wants to be the first one here to call?!