From the Old West Shootout Guide:
Old West Shootout is a set of free rules accompanying em4miniatures' Old West Heroes, Painted Miniatures Set 2. It is designed for use with either or both of em4's Old West Heroes Painted Miniatures sets. Shootout gives a fast fun game but don't let the simplicity fool you. Good tactics and an iron nerve are required to play and win Shootout.
A Western town plan is provided on mini CD ROM with the miniatures set.
Additional Miniatures available in Old West Heroes, Painted Miniatures Set 1. This set like Set 2 above comes with 5 pre-painted miniatures and 5 distinctly colored dies (but no CD ROM or rules).
New sets of these miniatures (Both Set 1 and Set 2), come with the multi-colored dice, CD ROM and colored token sets.