While running with the M203 selected, you actually see the grenade in front of you, floating in the same position that it has when you walk.
Here a screenshot, quite hard to see but just take a look near the compass...

Step to reproduce:
1. Load a map with the USMC on it, like Edjo, Fallujah, Jabal, etc.
2. Request a Grenadier kit.
3. Select the M203 (whatever it's HE or Smoke it do the same)
4. Run (Sprint) and you'll see what I talked about...
You can only react this bug with the M16A4, I tried with the M4 and it seen to be O.K.
Thanks for reading
-Bob

