Weapons have been normalized. What this means is that "prebuffs" have been buffed to modern levels and "prenerfs" have been nerfed to modern levels. Additionally, more minor things like aliases and names of weapons have all been normalized. A visible change of that is that you will now have a proper mod prefix instead of "custom" if the mod now bestows one. If you are a prenerf weapon collector, welp, sucks for you.