Weapons that have the capacity trait typically have multiple barrels or chambers capable of containing a bolt or round of ammunition. Capacity is always accompanied by a number indicating the number of barrels or chambers. After a capacity weapon is fired, you can select the next loaded barrel or chamber as an Interact action that doesn't require a free hand. You can use abilities that let or require you to Interact to reload to switch barrels or chambers of a capacity weapon instead. Each barrel or chamber can be individually reloaded after it's fired as a separate Interact action.

Combination weapons combine the functionality of melee weapons and ranged weapons in unique or unusual ways. A combination weapon has a ranged form or usage and a melee weapon form or usage. The combination weapons table lists the ranged weapon statistics first and the melee weapon statistics indented beneath, just above the ammunition. Switching between the melee weapon usage and the ranged weapon usage requires an Interact action. However, if your last action was a successful melee Strike against a foe using a combination weapon, you can make a ranged Strike with the combination weapon against that foe without fully switching to the ranged weapon usage, firing the ranged weapon just as you hit with the melee attack. In this case, the combination weapon returns to its melee usage after the ranged weapon Strike.

Since a combination weapon is one weapon with two usages, both usages share any fundamental runes. You can put a property rune on a combination weapon as long as it's appropriate for either of the two usages, but if only one of the usages meets the property rune's requirements, the effects of the property rune only apply for that usage. For instance, a vorpal axe musket only applies the vorpal property rune when you're using it as an axe. Due to their complexity, combination weapons can't have another weapon, such as a bayonet or reinforced stock, attached to them.

Critical fusion is a trait for combination weapons that grants you two additional options for the critical specialization effect when using the combination weapon's melee version to make a melee attack while the ranged weapon is loaded. If you choose to use one of them, it replaces the melee usage's normal critical specialization effect.

First, if the ranged weapon is a firearm, you can discharge it to create a loud bang and concussion, using the critical specialization effect for firearms instead of the melee weapon group's critical specialization effect. Second, you can choose to discharge the ranged weapon to increase the critical hit's momentum or shoot the foe as you attack in melee, dealing 2 additional damage per weapon damage die. Both of these options discharge the ranged weapon, which typically means you have to reload it before firing it again.

Natural attacks with this trait can be used to attack creatures up to the listed distance away instead of only adjacent creatures. Weapons with this trait are long and can be used to attack creatures up to 10 feet away instead of only adjacent creatures. For creatures that already have reach with the limb or limbs that wield the weapon, the weapon increases their reach by 5 feet.