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Old October 15, 1999, 03:02 PM   #2
James K
Join Date: March 17, 1999
Posts: 21,794
The Thompson mag runs .975", the M3 Mag is .980" at the magazine body, but the top reinforcement is 1.075".

They are not interchangeable, and one can't (feasibly) be made from the other. Also, the feed is different, the Thompson being a true double column mag and the M3 a double column but single feed.

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