Not just ar-15 guns have increased in sales but guns in general. And gun sales have always been increasing and will likely continue to increase even though Biden did in fact call for assault weapon ban as you mentioned
https://theconversation.com/biden-calls-for-assault-weapon-ban-but-does-focus-on-military-style-guns-and-mass-shootings-undermine-his-message-198770
https://www.guns.com/news/2023/02/03/january-gun-sales-up-nationwide-42-months-above-1-million
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