The breech/tang area of this rifle reminds me of another unorthodox system that was used by the late Al Brown of Chiliwack, BC. He breech plugged his barrels with a large Allen socket headed plug, and made a standing breech that had a round peg protruding. The peg coincided with the socket of the plug and the barrel was securely held with pins through escutcheon plates along the forestock. A neat and effective system.