[RPG] Increasing threatened area with ranged weapons

No attack of opportunity is granted.

According to the Pathfinder's RSD attacks of opportunity are triggered only by:

• moving out of a square in the threatened area of a hostile creature. Exceptions are: the 5-ft. step, the withdraw action, and teleportation (but not necessarily casting a teleport spell).
• performing a distracting act while in a square in the threatened area of a hostile creature. This usually include:
  • attacking with a ranged weapon,
  • attacking unarmed,
  • delivering a coup de grace,
  • performing a combat maneuver,
  • casting a spell,
  • using a touch spell (if the spell is harmful you are considered armed; you don't draw AoO from the target, but sill draw from other enemies)
  • activating a spell-like ability,
  • activating a spell-completion magic item,
  • drinking a potion or applying an oil,
  • loading a crossbow,
  • moving heavy objects around,
  • picking up objects,
  • sheathing a weapon,
  • retrieving a stored item,
  • standing up from prone,
  • escaping from a net,
  • locking or unlocking a weapon to a gauntlet,
  • preparing to throw a splash weapon,
  • running,
  • using many skills.

Appearing into a square because of a summoning spell seems to not fall in these two categories.

However, appearing in the middle of a fight may or may not be considered a distracting act, according to how your group interpret Summoning effects.

Rule number 1: This is your world. Your rule. If you think that firearms would be common to the point of like, even the commoner protects his farm with a shotgun, hey..go for it!

Just keep in mind that you would have to make the guns Martial weapon instead of requiring a specific feat. So that any military-grade training will provide training with guns. Or maybe even simple weapon (depending if you use gunpowder or alchemical shells). Because it's not that hard to pull a trigger and point a certain direction.

Guns are really powerful in Pathfinder. I noticed that when I had two gunslingers at my table. I would throw them monsters with damage reduction and lots of touch AC..because your player will shoot and kill everything at range.

Also, if guns are that common, players shouldn't feel like they are the only guys in town with them right? If everyone has guns, even the goblins ambushing them on the road will be a really interesting encounter.