you're right they both only have audio in ports and no on board mic. If you are already using a video cable is it that much more difficult to run a mic and mount it on the rifle? of course the 2 wires would be taped together or even heat shrinked together (esentially making 1 cord) to keep from getting twisted and snagged and such.I do not believe either of these units has a built in microphone, they require external audio to come in via RCA or miniplug connections, they will process and containerize the file to (AVI / MPG / Etc) but standalone no audio capability.
HTXH
I am sure a small mic could be rigged on a 1" scope mount in a way it would be rail friendly and be protected by the 1"circle.
How far away is everyone trying to record audio from?