More like millions of magazines. Considering at least at one time Magpul had a back-order of supposedly 1 million magazines just for them. So then you add in all the companies making USGI mags/clones, Tro mags, Promags, Tapco's, etc...
But yeah it is hilarious I cant wait to see actual concrete statistics on how many more background checks, how many AR15's where sold, mags, etc.
I'd say the firearms industry probably saw its biggest percent increase in a single season ever...