r/NCD and various firearms related subreddits are all I miss from reddit.
Think it would be cool to start an instance dedicated to firearms where there's a general community and separate smaller communities dedicated to certain popular platforms or topics like r/longrange or r/ak47. If I take it upon myself to start this I'd try to keep it apolitical other than maybe a community dedicated to gun rights/control/policy discussion only.
It will be interesting to navigate the line between political and apolitical. I bet there will be people who try to push it, to make posts that are ambiguous as to which they are.