Wow. I started this thread AGES ago because of a genuine desire to help the 2000AD artists get things right in a tiny way. I'm really happy it's been largely taken in this spirit of complete anorakdom, and I'm very proud that some of the great and the good of 2000AD have graced it with their presence. Thanks.
I've noticed on the current Red Seas that all the flintlocks are firing exactly as flintlocks should: The frizen flies open, smoke comes from the pan and smoke, fire and a bullet fly from the barrel. I just want to say it hasn't gone unnoticed. Percussion cap muskets (the next stage of development in firing mechanisms, and more associated with the American Civil War) are another question.
As for Dante's Huntsman - I do realise that this is a special case, but you can only take that so far. Surely having a flintlock style hammer that doesn't actually do anything is a little... unlikely? silly? I like to think that whatever round the Huntsman decides to fire is activated by that anachronistic hammer.