Seeker's Sight:
This sight can be attached to a single two-handed firearm. When this is done, the sight becomes part of the weapon, but can be removed from that weapon with a full-round action. A firearm wielder using a firearm that has this sight can choose to spend a full-round action to either locate an invisible creature within line of sight or make a single shot that ignores the invisibility of a creature that she knows is in the area.
Dead Shot Deed:
At 7th level, as a full-round action, the gunslinger can take careful aim and pool all of her attack potential into a single, deadly shot. When she does this, she shoots the firearm at a single target, but makes as many attack rolls as she can, based on her base attack bonus. She makes the attack rolls in order from highest bonus to lowest, as if she were making a full attack. If any of the attack rolls hit the target, the gunslinger’s single attack is considered to have hit. For each additional successful attack roll beyond the first, the gunslinger increases the damage of the shot by the base damage dice of the firearm. For instance, if a 7th-level gunslinger firing a musket hits with both attacks, she does 2d12 points of damage with the shot, instead of 1d12 points of damage, before adding any damage modifiers. Precision damage and extra damage from weapon special abilities (such as flaming) are added with damage modifiers and are not increased by this deed. If one or more rolls are critical threats, she confirms the critical once using her highest base attack bonus –5. For each critical threat beyond the first, she reduces this penalty by 1 (to a maximum of 0). The gunslinger only misfires on a dead shot if all the attack rolls are misfires. She cannot perform this deed with a blunderbuss or other scatter weapon when attacking creatures in a cone. The gunslinger must spend 1 grit point to perform this deed.
I'm assuming you can't mash these two together? There's a traffic jam on the full round actions but dead shot is still technically one single shot.
