Azur Lane Destroyer Gun Guide: Best Guns for Gunboats and Barrages

To choose the best destroyer gun in Azur Lane, check whether your ship relies on raw Firepower stats or attack frequency to trigger barrages. Equipping a slow, high-damage gun on a torpedo specialist delays its barrage cycle, while giving a rapid-fire trigger gun to a primary gunboat wastes its main gun scaling.

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Destroyer Gun Comparison

Gun Name	Ammo Type	Optimal Target Armor	Primary Fleet Role
Twin 130mm (B-2LM)	High Explosive	Light / Medium	Pure Gunboats & BB Auxiliary
Single 138.6mm Mle 1929	High Explosive	Light	Alpha Damage Gunboats & BB Auxiliary
Twin 128mm SK C/41	Armor-Piercing	Medium / Heavy	AP Specialists & Light Cruiser Auxiliary
Twin 114mm (PR3 Mk IV)	Special Normal	All Armor Types	Hybrid Barrage Gunboats
Twin 100mm Type 98	Normal	Light (Anti-Air utility)	Budget Hybrid & Anti-Air Buffer
Single 76mm AA Gun	Normal	All (Proc trigger only)	Pure Barrage & Skill Triggers
Twin 76mm RF Mk 37	Normal	All (Proc trigger only)	Upgraded Barrage Trigger

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High-DPS Guns for Gunboats and Secondary Slots

Gunboats feature high Firepower stats, main gun efficiencies between 130% and 160%, or a secondary gun mount (+1 Main Gun Base). Ships such as Tashkent, Z23, and retrofitted Laffey deal the bulk of their damage directly through shell output and require high base damage per volley.

Twin 130mm (B-2LM): Delivers the highest raw High-Explosive (HE) damage against light and medium armor targets. Its tight shell grouping makes it the top choice for primary gun destroyers like Tashkent. It is also an elite auxiliary choice for battleships intercepting suicide boats.
Single 138.6mm Mle 1929: Provides high single-shell HE alpha damage. While its single-shot pattern has a wider spread than twin-barrel alternatives, it delivers strong burst damage against light-armor targets and helps break light shields.
Twin 128mm SK C/41 (Gear Lab): Fires Armor-Piercing (AP) rounds suited for stages featuring medium- and heavy-armor enemy hulls. It penetrates frontal shields and hits targets in a line, making it the best option for AP-scaling ships like Z46, as well as an effective secondary weapon for light cruisers.

Balanced Guns for Hybrid Destroyers

Hybrid destroyers possess capable Firepower stats alongside powerful All-Out Assault barrages. These hulls require low reload times without sacrificing weapon DPS.

Twin 114mm (PR3): Uses specialized normal ammunition that bypasses standard normal-ammo damage penalties against medium and heavy armor. With a reload cycle of roughly one second and a tight two-shot arc, it allows hybrid ships like Kitakaze to trigger barrages quickly while maintaining high main gun pressure.
Twin 100mm Type 98: Acts as an accessible alternative with rapid cycle speeds. It adds a flat +30 Anti-Air stat to the equipping ship, making it a functional option when running plane-heavy campaign maps in World 12 and World 13.

Fast-Firing Trigger Guns for Barrages and Skills

Torpedo-focused destroyers like Ayanami and Shimakaze have low Firepower and low gun efficiencies. Their gun slots serve primarily as timers to cycle All-Out Assault barrages or roll skill activations.

Single 76mm AA Gun (Blue): Offers the fastest base reload speed among destroyer weapons. While its shell damage is negligible, it maximizes the activation rate of All-Out Assaults for torpedo vanguards and cycles proc-chance skills, such as Eldridge's Operation Rainbow.
Twin 76mm (RF Mk 37): A Gear Lab weapon that retains a very fast firing rate while firing two rounds per volley, adding minor chip damage without slowing down barrage intervals.

How to Equip Destroyer Guns by Fleet Role

Follow these rules when outfitting your vanguard and main fleet slots:

Check the ship's main gun efficiency and skills. If gun efficiency is above 130% or the ship has +1 Main Gun Base, equip the Twin 130mm, Single 138.6mm, or Twin 114mm. If efficiency is low and damage depends entirely on torpedoes and barrages, equip the Single 76mm.
Match ammunition to the stage. Use High Explosive guns for general campaign mob nodes, where light-armor destroyers and PT boats are common. Switch to Armor-Piercing guns like the Twin 128mm SK C/41 on boss stages packed with medium-armor cruisers, heavy-armor battleships, or shielded enemies.
Use high-alpha weapons on battleship auxiliary mounts. Battleships and battlecruisers that take destroyer auxiliary guns (such as Massachusetts or Georgia) need heavy damage per shot to destroy fast-moving suicide boats before they hit the backline. Never equip rapid-fire trigger guns like the 76mm in these mounts; use the Twin 130mm, Single 138.6mm, or Twin 128mm AP.