A dragon crossbow is a crossbow wielded in the mainhand slot. It requires a Ranged level of 60 to wield, can use bolts up to runite. It can be made by using a crossbow string on a dragon c'bow (u), requiring a Fletching level of 94 and granting 100 experience. Once made, the crossbow was untradeable, essentially binding it to the player who made it. However, in a hidden update on 14 January 2013 the crossbow and its variants became tradeable at a starting price of 19.2 million GP.
There is currently an issue where this version of the crossbow cannot fire Enchanted bolts. This is most likely a bug
Chaotic crossbow - The dragon crossbow has 25% lower accuracy than the chaotic crossbow and is limited to 25% weaker ammo choices, but it does not require dungeoneering tokens and does not degrade. The chaotic crossbow gives superior damage output overall and, besides the cost of upkeep, is unambiguously the better choice for those who have it.
Dragon crossbow - When wielded alongside the off-hand dragon crossbow and powerful crossbow bolts, it can have a damage output slightly greater than that of the dragon 2h crossbow, even though it will use the bolts up to three times as fast, depending on ability usage. In many cases it is more economical to use the two-handed crossbow even though the regular crossbow will produce more damage.