The Model 22T4 ISB Special was a model of hold-out blaster that was specifically manufactured and produced for the Imperial Security Bureau. Agents were assigned a 22T4 after being accepted into the Bureau as a personal sidearm. Selling of this blaster to civilians was strictly prohibited by the Galactic Empire, and they strictly monitored the production of the weapon by placing a specially-coded serial number on all models. This was also done to discourage tampering with the weapon. The 22T4 was initially produced by the Imperial Arms company before being produced by Imperial Munitions.
- Galaxy Guide 9: Fragments from the Rim
- Galladinium's Fantastic Technology
- Arms & Equipment Guide
- The Complete Star Wars Encyclopedia, Vol. II ("Imperial Arms") (as 22T4 hold-out blaster)
- Star Wars Galaxies Trading Card Game – The Shadow Syndicate (Card: Model 22T4 Hold-Out Blaster)
- Star Wars: Age of Rebellion Core Rulebook (First identified as Model 22T4 ISB Special)
- Star Wars: Force and Destiny Core Rulebook