If you want a weapon to fire more than one type of bullet/projectile at the same time, you can add multiple ShootableWeapon components to a single item. You can then add additional Item Abilities to the character to trigger those ShootableWeapon actions using their unique Action IDs. You may need to try using a different ability than the default Use ability for firing this weapon, since the Use ability will likely prevent other abilities from activating at the same time.
The item and perspective components will handle displaying and positioning the item, but the item won’t be able to do anything with just those components. . . .