Hosts may consider using kit restrictions to remove these weapons if this becomes an issue. There appears to be a hard limit on how many ammo types can be used in a MP game. Exceeding this limit causes the Client's ammunition to be ineffective. Hosts should consider limiting the number of clients if this becomes an issue. This bug is currently unsolvable.
Walls can be pock-marked even if out of the knife's range.
Thus, tangos will 'hear' you if you miss. No, it isn't the most realistic system, but it was the only way to portray a knife in the game. If you install two or more mods which each add new sounds, you may exceed this hard limit. As a result, Urban Operations will crash to desktop when you attempt to enable the multiple mods. Nor can the flashbang be taken with the MK3A2.