Kinggun's stuff is decent quality. Most of what that site sells is kinggun. If that's all steel, it'll be heavy. Price is prob on par with the FAB steel folders.
Other options are Stormwerkz adapters and then their or ACE folders. One piece is stronger than screw, but multi-piece options allow you to adjust both the angle and height of the stock.
I don't know if they carry, but my favorite aftermarket czech-made folder is similar to this but uses factory fixed stock. Length is great for tshirt weather, but a little long for winter coats/body armor.
