Filtvelt's mortal enemies Tortuga have produced variants of the Brigand equipped with: Mace's, Endo-Steel, XL engines, Medium X-Pulse Laser's, Angel ECM, Double Heat Sinks, and Improved Jump Jets. And I believe all of that equipment is produced on Tortuga itself (Or in orbit for the Endo-Steel)
The StarCorps Dossiers, which describes Vengeance Incorporated, describes their facilities as a cluster of repair bays, and indicated that they are not making its components themselves, just assembling stuff they had obtained through other means. in fact, the only component called out as locally produced is the standard armor.
all of the systems it uses are things that are in fairly common use at the time the variant appears, and could easily have been obtained through the black market or raids on supply ships. we also don't know how common most of those variants are relative to the standard model, which only has DHS and MPL's as its advanced tech.