Lindsay, to answer your question on the size of the 1/2 12ga frame, the distance between the firing pins was 1 1/16", the same as the 1 frame. The distance across the breech was 1 5/8", the same as a 0 frame. The distance across the hinge was 1 1/2", the same for frame sizes 0/00/000. The size of a 1 frame was 1 5/8". The height of the standing breech was 1 5/32", the 0/00/000 was 1 3/32" and the 1 frame was 1 3/16".
As you can see, the receiver had dimensions of a mixture of 1 and 0 frames. This made the gun lighter than most 12ga guns. There is a link found on the PGCA home page under FAQ's that has some more info on frame sizes.
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