Actually, there is a lot more than 72,000,000 that have bought guns. There ARE states like mine where if you have a CCW license, you need only fill out a Form 4473 to record the purchase, the NICS check is waved.
For example, since the Oresident has been office, I’ve bought at lease 10 guns of one sort or another.
There are also a whole lot of multiple purchases in which one background check covers multiple weapons. We have the hardware to defend our country. I just hope we have the character to defend the Constitution of the United States against all enemies, foreign and domestic.