The only thing SGA has on Thunderlord is Rate of Fire (which is offset by the damage, i.e. impact, differential). After that the SGA stats are quite poor. Even with the two powerful perks, the gun is still never used because it's stability is about the same as a green Darius-C, which is kind of sad since the SGA has supposedly 20-ish more stability and 12 less rate of fire. I thought the stability was supposedly upgraded with one of the recent patches? Either Range or Reload speed should be upped as well on the SGA imo, or just downgrade it to a Legendary since most of the Legendary HMGs are much better, even with poor perks.