yes there is...its called back boring.... basically you poke a fatter drill bit up its gunger and have a clean end to rifling some short distance back up the barrel..and gunsmith worth thier weight in goat shit can do it....and forestocks all over the country have been shortened by differing amounts to accomidate suppressors so worst case you spend $100 bucks to recrown and rethread 1-2" further back and cut 1-2" off end of the furniture and tidy it back up again. far better to have it accurate again and usable looking slightly naff than it looking origonalish and no good for anything.
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