SMC is a strange weapon:
It has a higher rate of fire than the Point D-Vulcan (8.7 vs 8.3 rps), despite the latter looking and sounding like it should spit out a veritable wall of lead.
It has the same spread as the Hawkins-RPR (3.5), a weapon that resembles a long barreled auto cannon. You would think it would out class a comically over sized P90 in that department.
Despite a slightly sharper fall off, it has a higher minimum DPS than the AR. The result is that the SMC has better maximum DPS between 0 and 60 meters, and between 175 and infinity. To put that in perspective, a B mech side dash is 19 meters.
Graph:
All this in a package that has one the lowest heat generations of any weapon in the game.
And here is where all these numbers are coming from.