Borderlands 4 Action Fist Review — ファームウェア
| Type | ファームウェア |
|---|---|
| Drop source | Randomly applied to gear (Shield / Ordnance / Class MOD / Enhancement / Repair Kit) of level 25 or higher |
This review was machine-translated from the Japanese original. Numbers are checked against the original; if the wording reads oddly, the Japanese version is authoritative.
Each time you land a finishing blow with melee, the action skill’s damage is increased, melee-initiated combo-type set.
Full (3 pieces) Effect
When killing with melee, action skill damage +25% (8 seconds)
- Suitable for builds that can create a flow of processing weak enemies with melee → hammering the action skill into strong enemies
- The 8‑second duration is short. It works best in dense fights where kills are continuous
- If the Volt Hunter uses the action skill as the main cannon, you may want to increase the number of attacks by stacking with cooldown reduction
The same melee‑initiated Reel Big Fist goes in the direction of “extending melee itself”. Use this one if the action skill is the main cannon, and the other if melee is the main cannon.
How many pieces to activate?
Firmware changes its effect in stages depending on how many of the same set you have equipped.
| Tier | Required number | Effect of Action Fist |
|---|---|---|
| Minor | 1 piece | (unverified) |
| Major | 2 pieces | (unverified) |
| Full | 3 pieces | When killing with melee, action skill damage +25% (8 seconds) |
The actual values for Minor / Major are unverified. Minor (1 piece) and Major (2 pieces) have set‑specific constant increases, and there is no reliable public source that lists the actual values for all 21 sets. This page will be updated as soon as they can be confirmed on actual hardware.
How to arrange the 5 slots (3+2)
Firmware can be attached to the five slots other than weapons — Shield / Ordnance / Class MOD / Enhancement / Repair Kit. The maximum configuration is 1 set of 3 pieces (Full) + 2 pieces from another set (Major) as a “3+2”, and you cannot stack two Fulls simultaneously.
If you place Action Fist on the Full side, choose a set for the remaining 2 slots that provides constant increases you actually use in your build. If the values on the 2‑piece side are dead, the effective maximum works only for 3 slots.
How to collect & replace
- It appears randomly on gear Level 25 or higher (not on weapons).
- Since the stats within the same set are considered identical across instances, there is no need to farm for a perfect piece (observed on actual hardware. Comprehensive verification of all 21 sets is ongoing).
- Gear can be transferred between items using the Transfer Machine. Only between the same gear type; item level and rarity do not matter. The donor gear is destroyed, and the transfer is locked after one use.
Related
- Comprehensive guide to Firmware set bonuses (Minor / Major / Full)
- Weapons & Gear Database
- Same category (ファームウェア): Airstrike / Atlas EX / Atlas Infinum
FAQ
What is the Full (3 pieces) effect of Action Fist?
When you get a melee kill, Action Skill damage is increased by +25% for 8 seconds. It activates when you equip three pieces of gear with the same Action Fist Firmware.
What kind of build uses Action Fist?
It’s a set suited for builds that chain melee kills into Action Skill attacks. You can place it on the Full (3) side, or aim for a constant boost by putting two on the Major side.
Is the Japanese name of Action Fist the official notation?
Yes. The in‑game Japanese name has been verified on a real console (2026-09-21). The English name is Action Fist.