You complement your bullets with the ability to cast spells.
Cantrips
You know two cantrips of your choice from the Wizard spell list (see that class's section for its list). Fire Bolt and Message are recommended. Whenever you gain a Gunslinger level, you can replace one of these cantrips with another cantrip of your choice from the Wizard spell list.
When you reach Gunslinger level 10, you learn another Wizard cantrip of your choice.
Spell Slots
The Spellslinger Spellcasting table shows how many spell slots you have to cast your level 1+ spells. You regain all expended slots when you finish a Long Rest.
Prepared Spells of Level 1+
You prepare the list of level 1+ spells that are available for you to cast with this feature. To start, choose three level 1 spells from the Wizard spell list. Chromatic Orb, Jump, and Shield are recommended.
The number of spells on your list increases as you gain Gunslinger levels, as shown in the Prepared Spells column of the Spellslinger Spellcasting table. Whenever that number increases, choose additional spells from the Wizard spell list until the number of spells on your list matches the number on the table. The chosen spells must be of a level for which you have spell slots. For example, if you're a level 7 Gunslinger, your list of prepared spells can include five Wizard spells of levels 1 and 2 in any combination.
Changing your Prepared Spells
Whenever you gain a Gunslinger level, you can replace one spell on your list with another Wizard spell for which you have spell slots.
Spellcasting Ability
Intelligence is your spellcasting ability for your Wizard spells.
Spellcasting Focus
You can use an Arcane Focus or a Ranged weapon as a Spellcasting Focus for your Wizard spells.