The gun scavenger is a gunslinger archetype with high-risk-high-reward mechanics that increase misfire chances in exchange of great benefits :
Go By Feel (Ex)
A gun scavenger’s intuitive and unique style leaves her firearms prone to misfire, whether as a result of using too much powder, using imperfectly milled parts, or any number of other minor inconsistencies. When using a firearm, a gun scavenger cannot reduce that firearm’s misfire chance to 0; it can always misfire on a natural 1.
A gun scavenger gains the following deeds at the listed level.
Change Out (Ex) At 1st level, as a full-round action, a gun scavenger can remove the broken condition from a single firearm she is currently wielding, as long as that condition was gained by a firearm misfire. When she does, she can replace the broken part with a specialized, short-lived component that does one of the following: gives the firearm the scatter weapon quality; increases the damage dealt by the pistol-whip deed by one die size; or increases the firearm’s range increment by 10 feet. A firearm with such a modification increases its misfire chance cumulatively by 1 each time it is fired until it misfires. When it does misfire, the effects of the temporary component are lost. A gun scavenger must have at least 1 grit point to perform this deed. Alternatively, if the gun scavenger spends 1 grit point to perform a change out, she can either perform the change out as a standard action instead of a full-round action, or perform the change out on a firearm that isn’t broken.
I plan to get a Pistol of the Infinite Sky when the party's magic item crafter can possibly make one :
This pistol never needs to be reloaded. After one shot is fired, a bullet and powder magically appear in the chamber. This ammunition never suffers a misfire.
Then what happens if a gun scavenger rolls a natural 1 when using a Pistol of the Infinite Sky or tries to modify it with Change Out ?