It’s not that easy. The vast majority of imports are banned and the remaining sporting imports are subject to significant restrictions. The overwhelming majority of guns sold in the US are produced in the US, even ones from foreign manufacturers. It’s not that dissimilar to cars.
I wouldn’t say that it’s the ‘vast majority’ of imports that are banned. The Gun Control Act of '68 mostly ends up applying to very small, often cheap, pistols (“Saturday night specials”), and guns that don’t have a “legitimate sporting purpose”. The ATF has said that practical shooting competitions (e.g., two gun, three gun, etc.) doesn’t count as “legitimate sporting purpose”, but the IWI Tavor is sold in the US, and is manufactured in Israel. source for that claim
Right now Turkish guns are having a moment. The Turks are making cheap firearms–sometimes very good, sometimes just cheap-- and sometimes making outright clones of more popular popular firearms. True, you’d be supporting Erdogan, but hey, you can’t always win.
Personally, I’m waiting for someone to start importing KMR pistols. The KMR L-02 Orca OR looks like an improved CZ Shadow II Orange, but I suspect the $3200 price tag is lot steep for most people. :(
Turkey is actively killing and repressing the kurds of Syria, such as Rojava, so if we’re boycotting US manufacturers, might be good to avoid turkish one’s too if possible, to deprive their government of tax revenue.
I’m not really sure if there is an ‘ethical’ choice with the big manufacturers anywhere, just different degrees of bad, though definitely worth indirectly supporting the less bad option.
You could opt for small boutique builders that explicitly support leftists and trans, like KE Arms, but those are few and far between. Best resource I can find is this list from the liberalgunowners reddit wiki.
Alternatively, opt for buying used guns from lefitist gun stores (if you have one near you, or can order from them online to a local ffl). That’s probably the best option from a cost and ethics perspective.