AK-74 config incompatible with ACE
Because of an error in the AK-74 config, and because ACE adds a burst mode for the AI to the AK-74, this weapon will often play vanilla sounds in the hands of the AI. Many RPT tickets also result.
Information and ACE ticket is here: http://dev-heaven.net/issues/22455
I'm sure that any of the ACE devs in that ticket would happily tell you what the problem is, because personally I have no idea.