Hey, he's got a new hat!  That's not true - but The Force Awakens rerelease of Kanan Jarrus does include a new gun.  It's sort of like a Portal gun, but not - it combines with other gizmos to make a sort of a messy mortar thing.   If you missed Kanan, like nobody did, here's another chance - and if you're a weapon completist, here's something new.  Read on!