Can you tell us where you found those comments? From your post, I can't tell if it's some Model 922R, or perhaps 18 USC 922(r), for example.
A gunfight is not the time to learn new skills.
If you ever have a real need for more than a couple of magazines, your problem is not a shortage of magazines. It's a shortage of people on your side of the argument. -- Art Eatman