Arch-guns are heavy weapons, most frequently used in zero-gravity Archwing combat. Unlike traditional Warframe weapons, Arch-guns have no separate ammo reserve and magazine, instead having a regenerating magazine whose contents replenish to full when the weapon is not firing. The delay from ceasefire to replenishment and the speed of ammo regeneration varies between different Arch-gun models. Because they have no ammo reserves, Arch-guns essentially have unlimited ammunition, and thus do not require replenishment from ammo pickups.
There is a wide variety of arch-guns, with different trigger types, effective ranges, and projectiles. However, they all use the same Arch-gun mods. As a brief rundown of the more special types, the Fluctus, Grattler, and Velocitus have travel time; and the Corvas and Velocitus have charge fire. The remaining weapons are hitscan (Cyngas, Dual Decurion, Imperator, Phaedra at time of writing), and tend to perform like variations of certain standard guns.
While normally only usable in Zero-G, Arch-guns can be utilized in ground combat by installing the Gravimag upgrade, after an Orokin Catalyst is installed. This enables the Gravimag-enabled Arch-gun equipped as a Heavy Weapon in Vehicle mode (see Arsenal) to be called down via an Archweapon Deployer, allowing a Tenno to use the weapon in ground combat.
When used in ground combat, Arch-guns only have a limited amount of ammo along with using magazines and standard reloading. Once all of an Arch-gun's ammunition is used up, the weapon is removed and can only be called down again after a 5-minute cooldown period. Ground-based Arch-gun ammo can only be replenished by Heavy Ammo, which can drop from Corpus enemies in Heists. Picking up Heavy Ammo also resets the Archweapon Deployer's 5-minute cooldown. Ammo Case's ammo conversion does not work on grounded Arch-guns.
While wielding the Arch-gun in ground combat, the player is unable to switch to any other weapon, though quick melee can still be used. Activating the Archweapon Deployer again will remove the Arch-gun, with the cooldown based on the remaining ammunition upon unequipping.
Removed the dissolve FX when equipping your Atmosphere Arch-Gun.
Update 24.2 ‘ATMOSPHERE’ ARCH-GUN WEAPONS
It’s time we equipped some serious floor firepower! All Arch-Guns can be used on the ground - or as we like to call it ‘Atmosphere’ - with the use of a ‘Gravimag’. Gravimag is obtained from Clan Research, or as a one-time reward from the Orb Heist Phase 3 Bounty, and can be installed on any Arch-Gun (with an Orokin Catalyst installed) via the Upgrade Arsenal - similar to installing a Catalyst.
Comparable to the Archwing and K-Drive Launchers, a respective Gear item known as the Archweapon Deployer is required to activate your Atmosphere Arch-Gun. The Archweapon Deployer can be obtained by completing the Orb Heist Phase 3 Bounty.
Atmosphere Arch-Gun General Changes:
Atmosphere Arch-Guns consume Ammo as opposed to unlimited Ammo/Battery in Archwing. Specifically new Heavy Ammo Drops which can be found from Corpus enemies in Orb Heist missions. Heavy Ammo Drops also reset the 10 minute cool-down when picked up, or replenish Ammo if needed.
Atmosphere Arch-Gun can be summoned in normal missions with the Archweapon Deployer, but once Ammo has been depleted there is a 10 minute cool-down until you can summon again. The intent here is to allow you moments of beefy damage output, and not become just another Primary/Secondary weapon.