I'm currently building an Arcane Duelist (Bard Archetype) with a single level in Mysterious Stranger (Gunslinger Archetype), because I wanted a gunwielding character who could do other things except shoot monsters in the face. The fact that I now have a reason to put points in perform-wind instrument and play an onminious tune on my harmonica with my gunslinger is just icing on the cake, but I digress.
He will be wielding as his main weapon a revolver. It's his Arcane Bond item as a matter of fact, so I can still use that hand for somatic components while keeping the other hand occupied.
Now, the Arcane Duelists get two free feats, Disruptive and Spellbreaker that rely on threatening spellcasters. I could threaten with my revolver, but I'd need Weapon Focus, Snap Shot and Improved Snap Shot on top of several other feats that I also need to make it work. I don't think I can afford that many feats. But since I still have a hand available, I thought I could hold a melee weapon or even a shield that I could bash with in that hand. I wouldn't be using it much, but for Disruptive at least, threatening the area is enough.
The problem is, I'm not sure I am threatening if I've already attacked with my revolver that round. Would it count as Two Weapon Fighting if I attacked with my gun on my turn but tried to make an AoO on the opponent's turn? If so, would that mean I cannot make the AoO if I hadn't taken the TWF penalty on my regular attacks, even though I'm not making any regular attacks with my off-hand weapon? And would that in turn mean that since I can't make an AoO, I'm not threatening the squares around me regardless of whether I wield a melee weapon?
