A Whirlwind's A Comin' - A Young Guns/Outsiders Crossover Fanfic

When the Regulators somehow get transported to the year 1965 in Tulsa, Oklahoma, they bump into the Greasers, who gallantly offer them a place to stay. At first they thought hanging out with real life cowboys would be fun but when Pat Garrett and his posse show up looking for Billy the Kid, the world just got a little bit more hellish for everyone. Rated for swearing, guns, violence and light graphics. Would highly recommend watching Young Guns before reading this, Outsiders too.