In the lower gun can you see how the "bead line" on the bottom of the barrels flows into the line between the ball and the flat of the reciever? That is standard. The top gun the beadline slopes down and away from the ball/flat and misses it by probably an 1/8".
Also it appears to me that the barrel breech face extends beyond the ball down low. That the breech face stick out to the side, but just on the bottom.
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