Mace Multipistol: Would one potency rune work for both uses?

[Aristophanes]

I'm making a 3rd level Thaumaturge with a Strength of -1.
I like the Multipistol because the melee version is finesse.
How many potency runes do I need for it to work for both options?

[HammerJack]

One. From the Combination weapon rules:

Quote:

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.

[Aristophanes]

HammerJack wrote:

One. From the Combination weapon rules:

Quote:

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.

Thanks Hammer Jack!