Oh. Above you mention that the Infernos are not tied to SRMs...Huh? They seemed to be pretty clearly based on SRMs for range. I think there are canonically inferno rounds for LRMs, but that doesn't look like what they are using here.
They modded the Infernos onto an Archer, so I would assume they are a normal weapon system. Doesn't seem like they are tied to SRMs but they are firing 2 missiles at a time.
...if not SRMs, I took that to mean LRM.