That spring seems like an odd way to fix that problem, but Mk VII's info appears to be correct. Pate mentions the problems in a general way, and the use of the M to indicate the modification, but does not go into specifics. Given the way that ejector is designed, it would seem possible that jams might be caused by slight variations in the case rim diameter.
(One writer says that the M indicates a separate serial number series for military contract pistols; that is obviously incorrect.)
Jim
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