Publisher 2K Games and developer Gearbox Software have announced total shipments for Borderlands 3 have topped five million units.

The new milestone was reached within five days after the game’s launch, and the game was purchased by 50 percent more users in the first five days over its predecessor, Borderlands 2, making it the fastest-selling game in 2K Games history.

“Borderlands 3’s incredibly successful launch is a result of the hard work and longstanding partnership between Gearbox Software and 2K,” said 2K Games president David Ismailer in a press release. “We are immensely grateful to everyone who played a role in making the Borderlands series the global, pop culture phenomenon that it is today, including hundreds of developers at Gearbox and many who have made this their life’s work. We also want to thank the Borderlands community. Mayhem does not happen by itself, and their passion for the series is what drives us to make each game an amazing experience.”

Borderlands 3 launched for Windows PC (via the Epic Games Store), PlayStation 4, Xbox One on September 13th.