There are not always "blind"holes in the actions ( I don't have as much experience as you guys but don't remember one that did have one). Most simply have a slot milled from front to rear, the bottom of which is covered by the bottom plate.This slot is closed off by the hinge pin, which is separate.The lumps don't hold the barrels "fore and aft", but do "up and down" and some "side to side"."Fore and aft", I believe the barrels are held by the hinge pin and standing breech. If I'm wrong, it certainly is not the first time.
Mike
