I think Demo version is better than Official, Why?
1. More Accuracy, in Official i can't shoot to the nearest enemies, if you think that you are a trained soldier, you can shoot an enemy at 10 meters without difficulties, or using the m9 for near attack easily, but in official is just impossible, the red point of arm is unused, i think BI need to improve this issue.
2. Performace, i have a great performance in Demo version why? i don't know, anybody have the same situation?
if someone knows how to adjust the accuracy like Demo version please tell me.