If the sides of the receiver have sufficient thickness, I imagine it would be straight forward to clamp the broken rear piece of receiver from the stock in position with the forward section and drill through both, one hole on each side, then tap a thread into the forward section and epoxy and screw both together with a high grade epoxy. Perhaps even making a steel cap on the rear section that the screws pass through and relieving and bedding it into the butt.
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