A list of all the new Job Actions from level 81 to 90 for Gunbreaker in Final Fantasy XIV: Endwalker. The tables are sortable and you can see the Range, Radius and MP cost as well as the Recast timers and whether the effects are Instant or on a Delay.

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Gunbreaker received 3 new actions in Endwalker.

Icon	Action	Lv	Cast	Recast	MP	Range	Rad.	Effect
	Heart of Corundum	82	Instant	25s	–	30y	0y	Reduces damage taken by a party member or self by 15%. Duration: 8s. Additional Effect: When targeting a party member while under the effect of Brutal Shell, that effect is also granted to the target. Duration: 30s. Additional Effect: Grants Clarity of Corundum to target. Clarity of Corundum Effect: Reduces damage taken by 15%. Duration: 4s. Additional Effect: Grants Catharsis of Corundum to target. Catharsis of Corundum Effect: Restores HP when HP falls below 50% or upon effect duration expiration. Cure Potency: 900. Duration: 20s.
	Hypervelocity	86	Instant	1s	–	3y	0y	Delivers an attack with a potency of 180. Can only be executed when Ready to Blast. This action cannot be assigned to a hotbar.
	Double Down	90	Instant	60s	–	0y	5y	Delivers an attack to all nearby enemies with a potency of 1,200 for the first enemy, and 20% less for all remaining enemies. Cartridge Cost: 2. This weaponskill does not share a recast timer with any other actions.