Fact:
Some bF4 guns are slower than Airsoft (yes, 270m/s is slower than Airsoft).
Fact:
Some BF4 guns have muzzle velocities that are closer to an Airsoft gun velocity, than they are to their real world velocity (by extension, this can make them “more equivalent” to an Airsoft gun).
What are you even hoping to achieve here? I’ve already proven what I stated to be true. What do you have left to argue about?