I've seen rebated standing breeches on European under lever rifles and shotguns that moved the barrels forward slightly before swinging open. This is the first I've heard of Parker Bros using a rebated breech. Indeed the shorter frame facilitates the moving of the barrel away from the breech face but also requires the action to open further so the shells will clear the top of the frame for loading and extraction. Im thankful they got away from that design!
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