AC6 Leg Parts Comparison: Top Builds for Ver. 1.09.1

This information is current as of App Ver. 90 / Regulation Ver. 1.09.1 (distributed on 2025/05/23). Greetings, Rubiconian mercenaries. This is Raven, a strategy writer for "Game Rack." The latest Regulation Ver. 1.09.1, distributed on May 23, 2025, has completely changed the battlefield. Numerous leg parts have been adjusted, and new assemblies are emerging. The resurgence of heavy parts is particularly notable, making the choice of legs, which form the foundation of your Armored Core (AC) build, an even more crucial factor in mission success and PvP victories. This article thoroughly compares and explains all four leg types in the current environment, proposing the optimal legs for those aiming to become S Rank mercenaries.

Leg Type Characteristics and Notable Part Performance List

First, let's review the basic characteristics of each leg type and the performance of parts particularly notable in the Ver. 1.09.1 environment. Use this as a guide to find the legs that suit your combat style.

Bipedal: The Battlefield Standard, Master of Versatility

Characteristics and Basic Tactics

Bipedal legs are arguably the most standard leg type, a symbol of the 'Armored Core' series. They come in a wide range from lightweight to heavyweight. Ground-based Quick Boost (QB) has minimal recovery frames and can be used continuously, allowing for intuitive evasion and range adjustments. While not specialized for particular situations, their high versatility to adapt flexibly to any battle situation is their greatest asset. They will serve as the foundation of assembly for all mercenaries, from beginners to advanced players.

Ver. 1.09.1 Notable Parts and Recommended Builds

Heavy Bipedal "2C-3000 WRECKER"

• Pros: Various defensive stats improved in Ver. 1.09.1. Combined with its already high Attitude Stability, it excels in shootouts, absorbing enemy attacks while dishing out high damage.
• Cons: Due to its weight, mobility is inferior to other lightweight and mediumweight types. EN management also becomes crucial.
• Recommended Build: A heavily armored front attacker equipped with gatling guns or shotguns in both hands, ensuring EN efficiency with the "VP-20D" generator. Withstand enemy attacks and aim for massive damage from a stagger.

Medium Bipedal "IA-C01L: EPHEMERA"

• Pros: Improved horizontal jump performance and reduced weight grant it the mobility of a lightweight unit while retaining mediumweight defenses. Offers an excellent balance of offense and defense.
• Cons: Compared to specialized assemblies, it may fall short in firepower or durability in certain situations.
• Recommended Build: A balanced assembly that maintains mid-range combat with rifles or laser weapons, uses mobility to flank enemies, and follows up with shoulder missiles. Its adaptability to various opponents is a key appeal.

Heavy Bipedal "IB-C03L: HAL 826"

• Pros: AP (Armor Points), weight, and EN Load improved, making it a top-tier heavy bipedal leg with good synergy with Coral weaponry. Its high Load / Carrying Capacity allows for stable combat even when equipped with numerous heavy weapons.
• Cons: The part itself has a high burden, often limiting choices for generators and boosters.
• Recommended Build: A high-firepower build combining it with a Coral generator, focusing on high-output EN weapons. Crush enemies head-on with overwhelming AP (Armor Points) and defensive power.

Reverse Joint: Tricky Assailants Soaring Through the Sky

Characteristics and Basic Tactics

The greatest feature of Reverse Joint legs is their high jump performance, which consumes no EN. They can quickly gain altitude from the ground and launch three-dimensional surprise attacks. Their kick power and reach are also among the best of all leg types, making them extremely powerful for following up on staggered enemies. On the other hand, they have peculiar characteristics such as low Attitude Stability and susceptibility to impact, as well as longer QB (Quick Boost) recovery frames in the air compared to bipedal legs, making them a leg type for experts.

Ver. 1.09.1 Notable Parts and Recommended Builds

Heavy Reverse Joint "RC-2000 SPRING CHICKEN"

• Pros: Attitude Stability and Load / Carrying Capacity Limit were buffed, making it easier to equip heavy armaments, which was previously a weakness. Surprise tactics like "firing grenades while diving" using its jumping power are now more powerful and stable.
• Cons: Even for heavy reverse joints, durability remains a concern compared to bipedal or tank legs of the same class. Maneuvering to avoid damage is essential.
• Recommended Build: A hit-and-run build equipped with "SG-027 ZIMMERMAN" shotguns in both hands and "SONGBIRDS" grenade cannons on both shoulders. Use a large jump to get above enemies, unleash high firepower to inflict stagger, then follow up with a kick. This configuration also shines in certain boss battles.

Tetrapod: Aerial Fortresses Dominating the Battlefield with Hovering Firepower

Characteristics and Basic Tactics

The greatest feature of Tetrapod legs is their hovering capability. They can maintain stable firing while staying airborne, projecting firepower unilaterally while evading attacks from the ground. The ability to use powerful heavy weapons like grenade cannons and laser cannons without a bracing animation is also a significant advantage. However, they also carry the risk of high EN Load and reduced mobility during hovering, making them easy targets for enemy attacks.

Ver. 1.09.1 Notable Parts and Recommended Builds

Heavy Tetrapod "LG-033M VERRILL"

• Pros: AP (Armor Points), various defensive stats, and hover movement speed were all buffed. This significantly improved aerial survivability, which was a weakness, making it easier to operate as a stable aerial fortress.
• Cons: High EN consumption persists. The choice of generator is crucial for the assembly's viability.
• Recommended Build: A suppressive build equipped with a high-output generator, high-firepower laser cannons in both hands, and plasma missiles on both shoulders. Always position yourself above the enemy and dominate the ground by unleashing a barrage of fire.

Lightweight Tetrapod "LAMMERGEIER/42F"

• Pros: Its high-speed flight capability remains intact. Hit-and-away tactics primarily using missiles are still powerful.
• Cons: Various defensive stats were nerfed, and taking hits with the same feeling as before will quickly drain AP (Armor Points). More delicate evasion maneuvers are now required.
• Recommended Build: A high-mobility missileer build equipped with numerous homing missiles, constantly attacking from outside the enemy's range. To compensate for the nerf, it's essential to focus all attention on avoiding damage.

Tank: Ground King Trampling Foes with Unrivaled Durability

Characteristics and Basic Tactics

Tank legs are the ultimate leg type, boasting the highest AP (Armor Points), defensive power, and Load / Carrying Capacity Limit. They can operate any heavy weapon without bracing, and their stagger resistance is exceptionally high. On the ground, their turning performance via Assault Boost (AB) and drifting is surprisingly fast despite their appearance, ensuring they don't let a caught enemy escape. On the other hand, they have a clear weakness: low jump power makes them poor in aerial combat.

Ver. 1.09.1 Notable Parts and Recommended Builds

Lightweight Tank "EL-TL-11 FORTALEZA"

• Pros: Known as the "Wheelchair." In Ver. 1.09.1, its Attitude Stability, AB (Assault Boost) thrust, and QB (Quick Boost) efficiency were greatly enhanced, and it even underwent further weight reduction. In addition to its original ground mobility, its evasion performance and stability dramatically improved, allowing it to exhibit unmatched performance in close-range shootouts.
• Cons: Its weakness in aerial combat remains unchanged. Strategies are needed against maps with varying elevations or enemies with high hovering capabilities.
• Recommended Build: One of the most highly rated builds in the current S Rank match environment. Equipped with the "VP-20D" generator, and "DF-GA-08 HU-BEN" gatling guns or shotguns in both hands. This infight style uses high-speed drifting to evade enemy projectiles while closing in, overwhelming opponents with immense firepower and stability. Its mobility is like that of a light tank.

Summary: Choose by Tactic! Leg Selection in Ver. 1.09.1 Environment

With the adjustments in Regulation Ver. 1.09.1, the roles and distinct characteristics of each leg type have become clearer. Coupled with the enhancement of the "VP-20D" generator, heavy assemblies, which were often overshadowed by lightweight units, have seen a resurgence, and the rank match environment is becoming increasingly diverse.

• Bipedal: If you seek stable performance. They offer a good balance of offense and defense, adaptable to all situations.
• Reverse Joint: If you want to disrupt with surprise attacks and three-dimensional maneuvers. Their single-strike destructive power is unmatched.
• Tetrapod: If you want to attack unilaterally from the air. With air superiority, enemies stand no chance.
• Tank: If you want to crush everything in head-on shootouts. They boast unparalleled strength in ground combat.

Particularly the buffed "FORTALEZA" and "VERRILL" possess the potential to overturn previous tactics. Don't be bound by past conventions; try various leg parts, build your own strongest assembly, and aim for the top of Rubicon.