[harlikwin]

I think the main point is that under combat conditions most of these rifles perform very similarly, hence the similar HEK, ACC values. Frankly I Think they should be about the same for each rifle in a given caliber, and still very similar. The 7.62 round hits harder, but you can fire more rounds of 5.56 sort of argument.
I think that perhaps units equipped with optical sights might get some sort of accuracy bonus. BUT the problem is that the sights unitl very recently have not been issued en-masse. Each nation has some sort of optics that have been used on these rifles to include the russians. The problem in terms of this game is that its really a minutia and would be hard to implement (a new unit only with optical sights?)