I'm not sure if the forums have already addressed this query previously, but here goes.
Say I have a BARC speeder firing at a squad of B1's, flanking them so they're caught out of cover. The speeder's volley has Fire Support from a nearby unit of Clones, but the B1's would have heavy cover from the Phase I Clones in their current position.
Do the B1's gain cover from the overall attack? And if so, what level of cover and why?