Either Bungie creates a new exotic weapon for this, or you could take two fully upgraded and cannons of any rarity and, possibly with a item bought from Xur, fuse the two into one, dual wielded weapon, one in the left hand and the other in the right hand
-
Edited by Blue Sojourner: 12/22/2014 4:05:25 PMI love the secondary being a hand canon idea, but no dual wielding