I don't like talking about the alpha but Ill tell you this(because I am pretty sure they posted it somewhere).
Let say you are using a AK-74m for the Russia side of the game. You really like the gun. So you use it all the time when you are Russia. You end up unlocking a ACOG scope RDS , Holographic all that jazz right. Well lets say you unlock a G3 and like it. Have
fun unlocking all that again.
If its 400hours then i will not even try i will stick with a few guns and call it good. And i think you are right about that being platinum on all guns not to unlock them. This number seems to be fake.