I have been looking around for this gun and recently I was informed the stocks had troubles? Has anyone had one and experienced issues?
You do have to be careful with the stock. It is a terrible design, and leaves the wrist very fragile. When I sent mine back to AOA for service, they warned me to send only the action, because they had so many stocks broken in shipment.
If you can find a stainless steel pipe that fits snugly into the battery cavity and epoxy that fellow in there your problems will be over. Then just slide the battery in without the o-rings.