The Devil's Revolver - The Devil's Revolver, #1

She is Hettie Alabama - unlikely, scarred, single-minded, and blood bound to a revolver inhabited by a demon. The first book in an epic, magic-clad series featuring the Wild West reimagined as a crosscultural stereoscope of interdimensional magic and hardship, The Devil's Revolver opens with a shooting competition and takes off across the landscape after a brutal double murder and kidnapping - to which revenge is the only answer.
Hettie Alabama, only seventeen years old, leads her crew of underdogs with her father's cursed revolver, magicked to take a year off her life each time she fires it. It's no way for a ranch girl to grow up, but grow up she does, her scars and determination to rescue her vulnerable younger sister deepening with every year of life she loses. A sweeping and high-stakes saga that gilds familiar Western adventure with powerful magic and panoramic fantasy, The Devil's Revolver is the last word and the blackest hat in the Weird West.