Orcs in the Webbe has updated their Chain Reaction/Flintloque crossover rules. Go get the latest version from their website.
From the announcement:
In 2011 long time Flintloque fan and author of several well respected wargames rulesets, Bob Minadeo, wrote some rules for using your Flintloque miniatures with THW’s free Chain Reaction 3.0 rules.
Now, in 2014, Chain Reaction has been updated and THW have released a full supplement dealing with skirmish gaming in the Napoleonic Era. Orcs in the Webbe is proud to present the updated version of the hugely popular Flintloques & Muskets crossover rules.