Note that barrel manufacturer is E. R. Shaw, not ershaw. The barrels you might buy from him (or somewhere else) will be barrel blanks. They not only will require turning to fit the monoblock, they will require striking down the exterior dimensions (wall thickness) to suitable dimensions, chambering and cutting forcing cones, choking, and fitting of locking lugs and ribs. Lotsa work involved. What do you think in your sidelock design will be an improvement over something you might buy already made by experienced shotgun makers that would justify such a massive amount of work?
