I might not be a gun expert, but at least I know how to look up weapon specifications... So now that I have shown you up for the chump you are you suddenly change the topic from realism to gameplay. OK good move, since I can tell you the realism route is a battle you will lose everytime and not only against me, but against any FH2 dev you ask. Because we take this stuff seriously and research it.
About the Flak: This is a gun that needs to be able to hit planes that are kilometres away: what do you think how accurate it is?
To explain it again: FH2 weapons are all less accurate than irl, simply because combat distances ingame are usually a lot smaller. Most tank gun stats are reduced by half for instance, although I am not 100% sure. Tank battles did not look like in "Fury", with tanks circling each other etc... it was mostly tank sniping at each other over hundreds of metres. The same is true with machine guns. Generally speaking, modern weapons (past the musket era) are way more accurate than the people wielding them. Misses are not caused by weapon inaccuracy, but by people not aiming properly or not being able to control the recoil. The same is true in FH2. You claim weapons are 100% accurate, yet if you look at people's stats on rifle accuracy for instance, the number is much, much lower.
The vBF2 weapon system with it's huge deviation is catered to retards, it removes skill from the equation completely. That being said, in FH2 aiming skill is very secondary, the true skill is hiding, especially for infantry, as in any modern war.