Me and my friend went into a building for some cover so I could show him how to load a magazine. I had my M4 in my hand and decided to take out the mag with nine bullets in it, dropped it on the floor took the gun out pressed R to eject bullet inside and dropped it as well. Put the magazine in my hand and held left click to unload my mag. Looked into my inventory and none of the 5.56 ammunition was in my inventory. I had plenty of space to store it should it go anywhere in my inventory like it has happened to me before when I was using a mosin and ejected the bullet in the chamber. Ammo was gone completely, not on the floor even. Mag and M4 was still functioning as it should. only ammo was the problem.