In my case, the higher tier gears appear after fulfilling a certain amount of missions. As a loner, I've been taking tasks from loners of Cordon. Having wanted the exoskeleton of mercenaries, I went to Sakharov, changed my faction to 'ecologists', went to mercenaries and began to fulfill their quests. After about 8 fulfilled quests a higher tier gear appeared in their vendor' inventory. After another 8 or so quests the exoskeleton of mercs has appeared. Maybe you accidentally killed someone from these factions? Every kill decreases your reputation in this faction for -25.
Donkey_Fru
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