Geez Cracko,
Just pick up the phone, and call the NRA, and ask them to put you in touch with the guy who wrote the article. He is probably on their technical staff, sitting in the NRA building in Fairfax VA. Get him on the phone and ask him whether the receiver was really stamped or not. He can probably clear up the question in 2 minutes. If he finds that he made a mistake, he will happily print a correct in the next issue. Remington won't have to demand the correction.
Best,
Mannyrock