almost no country on Earth has banned firearms. They have just reclassified them.
So by your interpretation, they never really banned anything.
Interesting logic you have there Zoogster, but if you equate the word "ban" with any sort of government created impediment to owning a gun, you've misapplied the term.
Ban (from Webster's Dict.) (v) to prohibit especially by legal means <ban discrimination> ; also : to prohibit the use, performance, or distribution of <ban a book> <ban a pesticide>
There was no "ban" on those shotguns. If you think there was, I challenge you to cite me an appropriate section of the US Code to prove it. I can still legally buy or make a DD, including one of the reclassified shotguns (SPAS , USAS), just as can anyone who is not prohibited for some reason such as a felony conviction, insanity, or underage. IOW, you're using the word "ban" to mean placing any sort of restriction whatsoever on your ability to purchase or possess. I suppose by your definition the government has already banned all guns as there is an 11% federal excise tax on every completed firearm, and a 4473 must be completed by the initial non-licensee purchaser.