It blows my mind that the railgun is still bad after they released the Quasar Cannon, considering the QC is better at killing heavies than the railgun was pre-nerf. Now the railgun is only good against hive guards, which the AMR can deal with much faster and with more ammo to spare. I’d rather the railgun was made a primary or they just completely reverse the nerf so that the railgun is an option again.
Personally, I prefer the AMR or even the medium armor penetrating diligence, which can both kill a devastator in one headshot. The latter weapon is even a primary.