I own a model 31 with the sling in the stock. My issue is this: I got this .22 for my oldest son and he loves it however the stock broke and I need to replace it. I have searched everywhere I know and cannot locate one. I have found many regular model 31 stocks but they are of no use. Does anyone out there know where I can purchase the model 31 stock with the retractable sling? thanks for your help/