There was a UK modification to the magazine catch to prevent accidental release of the magazine. it was a bar tack weldedMade by Guide lamp division of General Motors. The same maker of the liberator pistol. They had extensive experience with metal stamping and welding. Probably made in '42-'44 time frame.
across the catch. You have a early barrel and magazine catch, the US manufactured a fence that went around the mag catch
to protect it from accidental release, you would need this part.
Like the WW2 Thompsons - serial number records are not found,
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