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I have a spare and it's not for sale because they are hard to come by and expensive. Numrich and Brownells used to carry them. You may want to check there but it's probably sold out. A JW-20 stock would fit - you can get the whole rifle for the price of a Browning replacement stock.
There was a rear half of a Browning (barrel and forend missing) in the EE a week or so back that the guy wanted $200 for. Stock on it looked pretty decent, too.