From publisher blurb:
This file covers 32 common and uncommon handguns of the early 20th century.
While these rules were developed with the Pathfinder Role Playing Game System in mind, they are also compatible with our previous 1948 titles and they are suitable for use with nearly any modern game.
With this file you get:
Everything you need to bring a new level of realism and excitement to your early 20th century adventure!