This is the core rulebook. Blurb from the kickstarter:
Simply put, the Aces and Eights Reloaded game is the second edition of the world’s best selling, state-of-the-art, game-of-the-year wild west role playing game. This new edition will be leathered (if you choose Gunslinger! or higher reward level) and gorgeous, just like the first edition. Aces & Eights is a game that has the fastest, yet most precise combat system while still focusing more on roleplaying opportunities and character development than any other game. There are no levels and dozens of professions from which players can choose and even change as opportunity presents itself. Want to be a prospector because gold’s been found, sure thing. The mine’s played out before you stake a claim, you can turn to selling hardware or become a bandito or gunslinger. That doesn’t work, maybe a lawman or gambler? At each stop you can further develop skills and abilities used while following those professions. The final game will be 300+ pages, the last edition weighed-in at 400. All versions of the game except PDF come with 2 silhouettes, Standard Shot clock and Shotgun Shot Clock.