I had occassion to see a somewhat beat up M1 Thompson. It had the barrel replaced with a finned barrel and compensator. It also had a Lyman sight on it.
Upon closer inspection, I determined the Lyman sight was being held with a couple of shiny phillips head screws.
Nothing like good gunsmithing!!! All this could have been yours for $7,500 (pre-86 gun).
Sorry, I don't have a photo.
Thompson I Recently Saw
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