If you looked at the textures closely in Crysis 1 it said the Scar used 6.8x45mm rounds, which would explain the more damage done compared to the FY71. But apparently now the scar shoots a round smaller than the 5.56?

What makes you think it has changed?

Its just a gun. But I've noticed its more of a spray weapon. Probably because of the lack of control you get with a console controller.

i feel if your using iron sights its far more accurate than crysis 1

It has changed as said in the beta info page. The weapon information. I'm just saying it's really not even following the crysis canon.