No Touch Attacks
Guns use normal ranged attacks, except for:
The Deadeye deed changes to (change bolded for emphasis)
Deadeye (Ex): At 1st level, the gunslinger can resolve an attack against flat-footed AC instead of normal AC when firing within her firearm’s first range increment. Performing this deed costs 1 grit point per range increment beyond the first. The gunslinger still takes the –2 penalty on attack rolls for each range increment beyond the first when she performs this deed.
Several magic items also change, but I haven't listed them here, that'll wait until someone buys one.