Has anyone had occasion to widen the barrel channel on a Tupperware accustock? I have a 16FCSS (.308 Win.) and would like to rebarrel with something a bit heavier than the pencil barrel fitted by the factory. I am wondering if the margins of the barrel channel are solid or if I start rasping on them will I cut through the poly exposing a hollow cavity? I would appreciate the benefit of anyone's experience who has modified one of these factory stocks. Thanks.