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Better accuracy in the weapons, better sounds on recharge and shoot, no zoom in iron sights and more...List of ("ONLY MOST IMPORTANT") changes:AK 74 the distance of effective shoot now is 500 m , the cadence of shoot are increased in 625 RPM and the weapon have more accuracyAK 74u the weapon have more accuracy and the RPM are increased to 700 RPMthe LR300 have more accuracy and the rate of fire now is 950 RPM , effective shoot distance now is 300 mand same changes in other weapons ( the Rate of fire, and the effective shoot distance is the REAL VALOR OF THE WEAPON, i found it in Wikipedia xD.