My personal headcanon for Feral does adopt a bit of both. Where the technology might be a bit out there for him. That Feral and his people might have gear consistent with other Yaujta, but the real advanced stuff doesn't belong to them. He gets how to use the equipment but it didn't originate with him.
Bringing it to his pistol, he might have been given the weapon similar to how Naru acquires hers from Adolini, my thought is that he's given a weapon for whatever reason to aid in his hunt. The two having parallel journeys which could be supported by the EU. Hunting Grounds flavor text for the Elder sword specifically says that older hunters will give a weapon (in this case the sword) to aid younger hunters. The weapon might not have originated with him but could be given to him in a similar manner.
And given Greyback does acquire Adolini's pistol, it might be why he hung onto it for so long. He might've given Feral a pistol to aid him in his hunt but once he died he replaced it with Adolini's for whatever reason.