Once you have an imbued, mana-charged ammo box equipped in a Curios slot and stocked with matching rounds, you need to switch your weapon into its spell-casting state. Firing spells out of a gun barrel makes the magical projectiles travel much faster than normal casting.
Binding the IronsMode Key
1. Press Esc to pause the game, then open Options and select Controls -> Key Binds.
2. Scroll through the list or use the search bar to locate the keybind for IronsMode.
3. Assign it to an unused key that is easy to reach during combat without conflicting with your firearm reload or aim controls, then click Done.
Firing Magical Projectiles
1. Hold a compatible firearm in your main hand.
2. Press your newly assigned keybind to turn on IronsMode.
3. Confirm that a spell is highlighted in the Spell Selector located in the bottom-left corner of your screen.
4. Reload your gun so it chambers rounds linked to your active magic setup, aim at your target, and shoot to launch high-speed spells straight from the barrel.