The q-bomber was a prototype bomber produced by Incom.
Affectionately known as the "Snail"; the fighter is a slow but precise bomber and in the absence of a hyperdrive is rendered totally dependent on carrier ships. The q-bomber also lacks landing gear that can support the "shell" typically if a q-bomber is successful in dropping its entire pay load it would be required to shed the empty bomb carriage and head straight back to it's host ship (it has been known, on occasion to great affect, for the shell and its payload to be released on unsuspecting Star Destroyers and enemy strong holds). Snails are usually released from specially fitted racks in hangar bays gifting the fighter a, much needed, boost.
The Snail is a rare fighter, the inability to produce more "bomb carriages" has become its undoing...unless the Rebel Alliance can produce more carriages or improve the fighter's landing gear to support the shell; these fighters will become obsolete very soon.