gundamexplored:

“The ReGZ was a MS based on the frame of the Z Gundam, with different armor. It wasn’t very high performance, and a backpack containing a mega particle beam cannon used in cruisers was to be installed, to turn it into a support MS.

Amuro had strongly encouraged them to be mass produced, so as to supplement the inferiority of the Jegan, the main MS of Londo Bell. However, this effort was semi-wasted by the appointment of Bright.

The Earth Federation Forces had requested requested in-advance that Anaheim Eletronics, which is around Von Braun, to develop a new MS and deploy it to Londo Bell as part of Bright’s appointment, effectively making it Bright’s gift.”

-from “Beltorchika’s Children”/ (”Char’s Counterattack” novel, by Yoshiyuki Tomino)