That's the first gun I've actually modeled in half a year or so. Glad to see that I improved in them, as normally I model vehicles.
I've gotten better at modelin weapons too, the Arm Micro is my best one I've made so far.
For anyone who wants to model the modded versions of the guns I only know of the AR's modifications.
Anyways:
Faster Reloading: Two magazines with white tape.
More ammo: Magazine is bigger. (FAL and Dragon have a bag of bullets on their stock)
Accuracy: Scilencer on barrel.
Call out: Laser sight under barrel.
Scope Zoom: ACOG scope.
Blindfire Accuracy: Stock that looks the same as the GMAL in the OP.