Infinity Ward has released Modern Warfare update 1.08! Nerfs the 725 & M4 again, footsteps tuned drastically, Piccadilly map rework & lots more. Infinity Ward also explains the footsteps tuning changes and how it’s different this time in a separate post.
Source: N4G PC Modern Warfare Update 1.08 Now Out: Piccadilly Rework, 725 & M4 Nerfs, Footsteps Tuning Explained