Several attachments that previously gave "hidden" buffs to ADS (Aim Down Sights) speed without penalizing stability were tuned. This forced players to choose between a "snappy" gun or an "accurate" one, rather than having both.
I can provide a specific guide or list the latest weapon changes if you tell me which one you're playing. Modern Warfare III Season 3 Patch Notes - Call of Duty call+of+duty+modern+warfare+3+14382+patch+patched
Released in late 2011, MW3 was the culmination of the original Modern Warfare trilogy. However, by 2013-2014, developer Infinity Ward had moved on, and the official Steam version received several updates (culminating in later builds like 1.9.461). These later patches introduced latency issues, altered weapon balancing, and—most critically for PC players—tightened restrictions on dedicated servers and modding. Call of Duty: Modern Warfare 3 – The