My latest book Investigator Weapons 3 for use with Call of Cthulhu in the Gaslight Era is finally out!
This book covers firearms and some other weapons in the period roughly between 1870 and 1910, from derringers to machine guns. As usual you will find all the relevant Call of Cthulhu stats, but also detailed descriptions and illustrations throughout, plus hints about how to use them against Man or Mythos. There are sections on firearm law, inasfar as appropriate, on combat rules, and much, much more. Whether you investigate by Gaslight or Down Darker Trails, this book should provide you with lots of inspiration and support.