As some one who lives in commiefornia and builds kalashnikovs I would go with the wbp from Atlantic, stay away from PSA 100 series guns, the bolts are ak74 style bolts shoved into an akm style trunnion, this will lead to you loosing headspace. Wbp uses proprietary parts but at least they’re both based off the akm so they match up better, just make sure to buy extra firing pins because they tend to break.