Beti was a customized blaster rifle with a short barrel, and it belonged to Sylvestri Yarrow. Chancey, her mother, gave it to her as a present, and Sylvestri jokingly named the rifle after her doll from her childhood. This blaster rifle's design bore similarities to the E-5 blaster rifle that the Trade Federation and the Confederacy of Independent Systems would later utilize during the latter part of the Republic Era.
The blaster rifle known as Beti made its initial appearance in the novel The High Republic: Out of the Shadows, which was released in 2021. In an earlier published excerpt from The High Republic: Into the Dark, the rifle's name was written as "Betty."