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I don't think there's anything wrong with having a thread specifically for it, since subbing Lu to use gunslash is more like subbing your main class. And there isn't really anywhere to talk...

Why wouldn't it be?

Fi/Lu is ok with gunslash, but it's probably better to stick with the Fi weapons.
Br/Lu is fun and has good katana damage, and the most reliable high end gunslash damage, so...

I would recommend looking into Br/Lu. The gunslash multipliers for it are balanced around average stance, so weak stance gives you a big bump in damage.
Fo/Lu has a high multiplier for gunslash, but...