Does anyone know if the upper and lower receivers of Thompson SMG have to be welded together, by U.K. law, for the current spec of U.K./E.U. deactivation or is it just the way that some are deactivated by some dealers/armourers, please? I know that the upper and lower receivers of the Bren are now all welded together but wasn't sure about the Thompson. Thanks for any information.
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