If it is just a crack, with no splintering or breakage and there is no build up of dirt, any competent cabinet maker or gunsmith can drill it & insert a dowel or pin(more then one if necessary), with an appropriate glue, and clamp it tight. Especially if glue can be forced into the crack, the repair should be stronger then when it was new. The down side is the dowels may show & some finishing touch-up will be necessary. You don't say which way the crack runs, but, in some cases the repairs can be hidden under the stock 'furniture'.
This has been a long-winded way of saying 'don't be afraid of a repaired stock'. Just be sure who ever does the repair knows what he is doing. A well intentioned amateur could destroy the stock.
Paul