The gun come with half disintegratable belts, heat effect, and several togglable(?) parts: Click the barrel, stock, bottom of the pistol grip, front of the beltbox mount to chage model.
When click the left of the receiver, a foldable dove tail will appear, and be aware that you can grab the topcover only when dove tail flipped open.
Click above the handguard trigger to toggle bullpup mode.
1.Using beltbox:
First grab your belt box and put it near the box holder frame, once it's attached to the gun, drag the beltbox and rotate 45 degrees then pull out the belt to reload like a normal MG.
After firing all the bullets, open the topcover, grab the lifter and lift it to release the empty belt segment, then grab the belt box and rotate -45 degrees and it will eject.
2.Using APinc Belt:
Just open the topcover and put the belt in, when belt is empty it will automatically eject.
3.Using AmmoBackPack
This bulky backpack holds 2000rnd of tracer. Like the APinc Belt, put the piece direct onto the gun, and put the backpack on your backpackslot, but be aware of emeny fire ----If the backpack received enough damage it will break and stop working! Also, if you put the PKM too far away from the ammobackpack, the belt will be ripped off from the receiver.