The ArMek corporation produced the R-Z0 retractable double blaster cannon, a type of blaster cannon. The Lambda-class T-4a shuttles were equipped with this particular blaster cannon model.
The R-Z0 retractable double blaster cannon was first referenced in the Starship Fact File about the Lambda-class shuttle, which appeared in issue 22 of Star Wars: Build the Millennium Falcon, a magazine series that came out on June 3, 2015. Before its inclusion in the official Canon, the 2010 LEGO Star Wars Ultimate Collector's Series set 10212 Imperial Shuttle had a display plate that incorrectly identified the R-T0 twin blaster cannon as the R-Z0 twin blaster cannon; this mistake was then repeated in Build the Millennium Falcon, thus carrying it into the new continuity.