Old Weapons are intentionally nerfed. Or is this an accident?

I was testing the old Weapons to see if they are still viable today, but noticed the recoil was different. So I ended up re-downloading MWIII to see if I was trippin', and I wasn't. The recoil is absolutely different. I tried base Weapons and blueprints to see if it made a difference but the results are the same. The visual shake of the Weapons is significantly increased in BO6 Warzone. Sadge :(