It is a stationary .50 mm machine gun that fires an infinite amount of light bullets. Its high rate of fire makes it a formidable machine gun to deal with Paratroopers, Rebel Infantry, and enemy aircraft. The AA Machine Gun does not provide any protection from the player, but it provides invincibility frames when the player ejects from it.
- In the "Tank Only" version of Metal Slug, rescued Regular Infantry would've jumped on the AA Machine Gun and fire on enemies. The soldier's sprites are reused for the Rebels using the Sea Satan's AA Gun.
|Standard||Handgun (Murder .50AE | Murder Model-1915 .38 Mk.1Am) | AR-10 | M-3685 | M60|
|Limited||Heavy Machine Gun | Rocket Launcher | Flame Shot | Shotgun | Laser Gun | Iron Lizard | Super Grenade | Enemy Chaser | Drop Shot | Two Machine Guns | Zantetsu Sword | Thunder Shot|
|Bombs||Grenade | Fire Bomb | Stone | Earring Bomb | Smoke Bomb | Monolith | Snowball|
|Melee||Knife | Tonfa | Hatchet | Tomahawk | Punching Glove | Stun Gun | Wrench | Vulcan Punch | Argentine Backbreaker | Moon Slasher|
|Other||AA Machine Gun | Thunder Cloud | Mobile Satellite | Armor Piercer | Anti-Materiel Rifle | Freeze Gun|