Some people think this rifle is a waste due to the large material requirements and lack of bonus stats.
Background
This section concerns content exclusive to the Warcraft RPG, and thus is not necessarily canon.
The extremely rare material known as dark iron is normally used in the forging of melee weapons and armor. Dwarven tinkers have spent a great deal of time adapting the special qualities of dark iron to ranged weapons, and this powerful rifle is the end result of their experiments.
A dark iron rifle is no mere flintlock or blunderbuss. Dark iron is so strong and heat resistant that tinkers have been able to employ liquid phlogiston instead of gunpowder to fire bullets. Such projectiles travel at phenomenal speed, and can travel much farther than those spat by an ordinary long rifle. A dark iron rifle requires a vial of liquid phlogiston for up to 10 shots. The dark iron rifle is so stable that its worst malfunction is an internal explosion that does nothing more than spew the phlogiston inside out in a brief gout of flame. This burst is flashy but not dangerous, though it does consume all the phlogiston within the weapon.APG 108-109