It surely will affect all weapons, but will it affect them to the same degree? I say no, sir. First of all, with burstfire and full-auto weapons accuracy degrades progressively with each shot fired until the burst ends. There's the issue with manual (read imprecise) recoil compensation, and there's the issue of COF bloom. Personally I can't think of any player who can control both recoil and bloom to a level that they don't matter at all. Secondly, accurate weapons gain more by inertia than inaccurate ones. If I fire multiple bullets with random spread through a wide cone, then it is completely irrelevant where my target is as long as it is inside the cone. It is completely irrelevant whether the target moves slowly and smoothly, or instantaneously and erratically as long as it moves inside the cone. The chance for each bullet to hit is exactly the same. However, a weapon which fires only one bullet through a narrow cone will miss the target that moves exactly as far. The only relevant difference is in how fast a target can move out of the cone, but for obvious reasons accurate weapons are affected stronger in this regard as well. To sum it up, inertia does affect all weapons, but it affects accurate semi-auto weapons stronger than inaccurate full-auto ones.