For an army that hasn't had a war in 40 years (I think their last toss up was the chinese vietnamese war) they sure love to change their small arms a lot!
Image the logistics of supplying an Army of 2 Million plus 500,000 Reserves All the time....that is without a war. By the time they likely finish equipping every solider with guns they can likely just start issuing the next design to replace the old model. For a country with the potential to field over 50-100 Million soldiers with full conscription they would be unstoppable in a field conflict if fully equipped. The arsenals of China would be a sight of Raiders of the lost ark x1000 for military crates I bet.