John, I've read that the square frame was a weak point, probably explaining why Parker changed to a radius corner in later designs. I've never seen one cracked, but I suppose it's possible. I used to have many Lifters but am down to only two at this time. One is 4054, 12ga with the square corner frame. I only shoot light reloads that are easy on the gun and me, both. Also typical of the early guns, it has offset firing pins. The original offset pins were prone to breaking. I learned how to make them so I could keep all my guns shooting. If you break an offset pin I have plenty. Plus these will not break. My other remaining lifter is a 10ga, with the check hook and radius corner. With the introduction of the top action hammer gun, Parker still offered the Underlifters, but modified with the longer frame with check hook. This is where the firing pins also changed to straight, like on the top actions. I guess the straight pins could break, but they rarely did.
Dave
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