Btw what kind of camera were you using and did you have a different mic on it? Because I cant get good sound quality and all my videos make the gun sound super quiet.
Cameras seem to be hit and miss with this. I've seen cheap cameras record cannon sounds brilliantly while my brother's Canon 600D makes the loudest cannons sound like mouse farts.
It's not necessarily a quality thing. I don't know enough about audio recording to say what it is but I suspect it's to do with how an audio device records certain frequencies (i.e. some may record lows quite well but mids and highs poorly).