Jillian Holtzmann took the initiative and built several Proton Sidearms. She introduced the Proton Blaster along with the the other Proton Sidearms after the Ghostbusters met Mayor Bradley. The Blaster was taken into the field by Patty Tolan for the battle with Rowan North and the Times Square Battle Ghosts. She kept it in her right leg holster. Of all the sidearms, it was the only one not fired or used in combat during the incident.
- The Proton Blaster was developed along with the Proton Grenade Launcher and they share some design traits.
- Both weapons were called "Proton Side Arms" during production.
- A early design of the "Proton Sidearm" were used in designing the Mattel toy, the Sidearm Proton Blaster.
- On the Regular Cover of Ghostbusters 101 #1, Erin is holding her Proton Blaster.
- On Cover A of Ghostbusters: Answer The Call Issue #2, at the top is the Proton Blaster.
- Erin has the Proton Blaster in the lower right side of Cover B of Ghostbusters Crossing Over Issue #6.
- Holder, Nancy (July 2016). Ghostbusters, p. 237. Tom Doherty Associates, LLC, New York NY USA, ISBN 076538843X. Narrator says: "Patty used her 'ghost chipper,' a device that sucked in a ghost, chopped it up into ectoplasmic bits, and shot the debris out the back like a burst of exhaust. She also had a proton sidearm that Holtzmann hadmadefor her."
- Jillian Holtzmann (2016). Ghostbusters (2016 Movie) Extended Edition; Chapter 14 (2016) (Blu-Ray ts. 1:44:40-1:44:42). Sony Pictures. Jillian Holtzmann says: "Guys, you all have your sidearms."
- fxguide "Who you gonna call? Call Illoura, MPC, SPI, & Zero VFX" 8/10/16 Line reads: "As an aside, the Proton pistol weapon shows up briefly in the weapon training montage slightly adapted from the original concept art. However, as real world toy companies get production artwork early, the actual toy gun one can buy from Amazon is modelled on this concept design (below right)."