MedicineBow, you're always welcome to disagree, but bear a couple of facts in mind:
1) The 200M number includes every firearm purchased before 1968 that is still out there and was transferred, inherited, etc.
2) There are significant restrictions that many of us (myself included) don't think about simply because, in our memory, they've always been in place. Machine guns, suppressors, interstate shipping, etc.
3) As it stands, the first buyer for every firearm in the US requires a NICS check.
Compare this to, say 1920, when a 10-year-old could have ordered a machine gun through the mail and had it delivered to his home.
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