BL-17 using a AAP-II blaster box.
The AAP-II blaster box was a model of AAP blaster box manufactured by Briletto Company and utilized by BL-series Battle Legionnaires. It was a rectangular device, mounted on the Battle Legionnaire's chest.
Appearances
Star Wars: Droids: The Adventures of R2-D2 and C-3PO — "A Race to the Finish" (First appearance)- A Race to the Finish picture book
Sources
"The History of the Mandalorians: Exploring the Evolution of a Mighty Race of Warriors" — Star Wars Insider 80- The New Essential Guide to Droids
- The Complete Star Wars Encyclopedia (Mentioned in multiple entries, but without own entry)