Just one more weapon to the game! Short barrel 7.62x 51

You got my vote for that buddy
I even know where it would be the best place for it --> Advisor
Lets hope they'll add it

I think it's unlikely for a variant of an existing gun to be added, especially when they use the same caliber.

That's a DSA SA-58, an American made FAL variant. They're unlikely to find their way to the middle east, but they are quite nice.