Contrary to what its name suggested, this armor was not primary used by bounty hunters but by spacers and criminals. In fact, the Bounty Hunter Armor was known for its widespread use among members of the criminal organization of Black Sun. It was also used by Blackguards and by Razor Runners.
After the Battle of Yavin, a band of spacers retrieved pieces of Bounty Hunter Armors and used them to craft their own Mandalorian armors in the Death Watch bunker on Endor.