Purchased many years prior to the Battle of Yavin by a denizen of the Outer Rim, who was a scavenger, R4-J1 began its own scavenging pattern, searching through junkyards for components. It was during this period that the droid manifested a peculiar characteristic: a tendency to improperly repair the devices it was tasked with fixing.
R4-J1 was produced as an action figure as part of Hasbro's new Legacy Collection "Build a droid" series. On the back of the packaging for these new Star Wars: Legacy figures, you'll discover five constituent parts that can be used to assemble four distinct Astromech droids, with R4-J1 being one of them. The Legacy figures that include these parts consist of Obi-Wan Kenobi wearing Clone armor (left leg), a heavy gunner Clone trooper (right leg), a Clone SCUBA trooper (head and middle leg), and the IG Lancer Droid (main body).