There's a perennial proposal in Area 51 (current incarnation is called The Armory) that's essentially half on-topic here, and half off-topic. A firearms SE actually made it to beta some years ago before being closed due to some sort of neglect that I haven't fully divined.
Since TGO isn't exactly setting the world on fire with activity, why not expand its scope to fully and explicitly encompass the latest Armory proposal? Namely:
Q&A site for shooting sports and weapons, including but not limited to guns, knives, and other arms; and ranging from theory and design to practical tactics, legal questions, and consumer considerations
It's sort of awkward right now that, for example, questions about weapons for hunting or sport shooting are (I assume) on-topic but questions relating to weapons for tactical or defensive purposes are not ... unless the defense is explicitly against an outdoor non-human predator? I can't even tell how abstract and technical questions regarding weapons should be received at present.