I've already made a long post regarding autocannons that you could always go view for an explanation on that. For those of you who don't care to do so, long story short is that the term "rotary autocannon" is misleading, and ANY autocannon can have a rotary barrel arrangement, it's just that RACs always do (even if concealed with a barrel shroud) and have a higher firing rate.
It's anyone's guess what that's supposed to be. My two cents? It may be the 3C, which has two machine guns instead of medium lasers, a smaller engine, and a PPC. It may also be the 3M, which has a LT-mounted UAC-5 in the LT, though the year's wrong for that. Considerably less likely explanations? The medium laser has multiple barrels so it can cool while rapid firing (not something you see in the art or fluff), or this particular Cicada has all three of its weapons in the LT (which is not canonical). It's definitely not the CDA-2A.
Who knows.
The Cicada, for whoever was asking, only carries 4 tons of armor - comparable with the Locust or any given mech about half its size. Very poor for a medium, but acceptable for a light scout, which is really all the basic Cicada is.
Edited by Der Kommissar, 09 May 2012 - 11:59 AM.