Yeah, that's a conflict in stats.
I would go with the one that doesn't match the others as being the typo that needs errata. So it should use Ammunition: bolts, not Ammunition: Firearm Ammunition.
Anyway, I would rule it as bow (or crossbow in remaster) using the bow/crossbow critical specialization effect for Critical Fusion.
Agreed. While I’ve heard of crossbows that use pellets, the description does say bolts and that it’s a crossbow mounted on another weapon.
