Java's Steyr AUG

this is my character Java's new weapon. It's basically a Steyer AUG with a couple modifications.
well here is the technical

Caliber: 5.56mm NATO (.223rem)
Action: Gas operated, rotating bolt
Overall length: 805 mm (with standard 508 mm barrel)
Barrel length: 508 mm (also 350 mm SMG, 407 mm Carbine or 621 mm LMG heavy barrel)
Weight: 3.8 kg unloaded (with standard 508 mm barrel)
Magazines: 30 or 42 rounds box magazines
Rate of fire: 650 rounds per minute
Effective range of fire: 450-500 meters with standard assault rifle barrel

It's modifications are a clearer magazine, a different shaped stock, smaller barrel, a kit of more barrels, a infrared scope with x-ray, normal and night scope modes.