When the player is not holding it, the other gun disappears while one of the guns is deposited in the character's gun holster. This also happens with the Doom Bringers and the Submachine Gun.
When in cover and aiming mode, only the right gun shoots while the left doesn't, even if it looks like it shoots. Keep pressing the shoot button to fire both.
To make it more effective, try to shoot by tapping the shoot button instead of holding it, so the left one will always shoot and it can fire faster. This mostly works with non-fully upgraded Dual Guns and Single Player, because you cannot move around while doing rapid fire.
It seems like it has a drum clip, but the reloading sound is a revolver-like sound.
It fires faster when walking, running or aiming. This only works when you are on a low tier on fire rate.
This is one of the most popular guns in Multiplayer used by low-leveled players.