If you either hit W & S in repetition, or shoot just as you stop moving forward or back, notice that any gunfire does not have vertical recoil on your aim.

I noticed this after walking forward and firing and stopping mid-fire, and noticing my shots had a close to perfect cluster on a nearby wall.

I tried this with the MXM on the Blufor side, and I continued to try it with an automatic MX SW, which had the same issue. I also tested the pistol.