Dual Colt Volcano is a pistol variant of the Dual Colt with volcano-like skin.
CF North America
In CF Vietnam, although the weapon description claims that this gun has an ammo of 18/36, this gun actually has 24/48 in-game, same level as Dual Colt HellFire. Moreover, this is the only variant that cannot be obtained permanently.
Dual Colt Volcano is the only reskined Dual Colt to not belong in any WS. It does bear resemblance to Dual Colt Magma, however.