"Burns hot, looks hotter"
The Acetylene MK.II is a full-auto Legendary AR that's designed to contend with any target its put up against. A small container of acetylene fuel is stored within the receiver, amping up its bullets and allowing it to deal Fire damage.

The Acetylene gains a damage bonus against unarmored targets for the next full magazine after breaking a targets armor, and deals more damage to armor by default.