GCA68Gun Control Act of 1968
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Not only did the GCA68 not destroy S&W and Ruger, several new manufacturers arrived.
Called "transferable machine guns" among machine gun collectors, these include only machine guns registered prior to 19 May 1986 and during the registration amnesty permitted by GCA68 from 2 November 1968 to 1 December 1968.
The provisions of GCA68 established a point system to determine if a handgun could be imported and the PPK was too small.