Most of the Glock switch shipments had come from China, and were destined for various locations throughout the United States, CPB said.

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Customs agents in Chicago said they seized thousands of illegal Glock switches shipped into the city last year, according to a statement Tuesday from the U.S. Customs and Border Protection.

Most of the Glock switch shipments had come from China, and were destined for various locations throughout the United States, CPB said.