I just completed a little experiment. I took two of the empty hulls that were fired in the gun and trimmed them back about an inch. When I put either shortened hull in the right barrel the gun closed OK. When I put them in the left barrel it was very hard to close. When I rotated the hulls about 180 degrees in the left barrel it closed OK. I put the hull back in the right barrel, rotated the hulls 180 degrees and the gun would not close. Apparently the hulls are being distorted during firing. I did notice that there is a very small burr on the top and bottom of the lower left extractor tang. The burrs appear to line up with the exposed firing pin.
