It’s funny that internet leftists try to separate themselves from “liberals”. It’s the Twitter version of “not like other girls”.
The firearm industry is politically powerful. By buying guns and ammo they’re feeding into it. And it’s not like they’re only buying basics, they buy a lot.
You can’t rightfully pretend to be an antifa super soldier revolutionary while throwing money at the gun lobby. The same one they allege funds right wing politicians and policy. Then there’s the firearms industry’s relationships with law enforcement and the military.
None of that would bring a problem if they’d just admit to buying guns because they’re fun, but they insist of framing everything as this epic altruistic struggle and it makes them look dumb.