The reload animation for the MK16 assault rifle is messed up. The character reloads it as if it's a Bullpup design. Which it is not.
Edit: I must have just gotten it glitched somehow. It's working fine now. After a few moments of roaming in my inventory and switching among all three of my weapons when messing around, the reload animation was normal. - None of this was in an attempt to fix the problem, I was just bored.