Arch-guns are primarily deployed whenever an Archwing is used in Archwing and Empyrean missions. However, Submersible and Free Roam missions instead continue to use primary and secondary weapons.
Unlike most traditional Warframe weapons, zero-gravity Arch-guns have no separate ammo reserve or magazine, instead having a regenerating magazine whose contents replenish to full when the weapon is not firing. Because they have no ammo reserves in their normal usage, Arch-guns essentially have unlimited ammunition and thus do not require replenishment from ammo pickups.
Almost all zero-gravity Arch-guns have Damage Falloff and projectile travel time.
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 Archgun 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 heavy-duty enemies like Bombards, Corpus Tech, and Ancients. Picking up Heavy Ammo also resets the Archgun Deployer's 5-minute cooldown. Ammo Case's ammo conversion does not work on grounded Arch-guns. Protea's Dispensary dispenses universal ammo which can restore the Arch-gun's ammo, but does not reset the Archgun Deployer's cooldown.
While wielding the Arch-gun in ground combat, the player is unable to switch to any other weapon. Base aim-glide time will also be reduced to 1 second. Activating the Archgun Deployer again will remove the Arch-gun, with the cooldown based on the remaining ammunition upon unequipping. Picking up objects or going into bleedout will also automatically unequip the Arch-gun.
Unlike zero-gravity Arch-guns, their atmospheric counterparts lack damage falloff and most of them are hitscan.
Atmospheric Arch-guns receive affinity while equipped according to normal rules, including the per-weapon split. As an example, having a Primary, Secondary, and Melee equipped with the Arch-gun out will result in 75% of shared affinity being split between 4 weapons instead of 3.
Arch-guns can be used by player-owned Necramechs as primary weapons. While they act mostly similar to Warframe ground combat Arch-guns, Necramech-wielded Archguns have a regenerating ammunition system.
Fixed an issue when using the same Arc-gun in Heavy Weapon slot and Necramech gun slot, where Affinity earned before first summoning your Necramech wouldn't apply to the Necramech's version of the Arc-gun.
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.