The decision came in a lawsuit brought by Redmond-based P.W. Arms Inc., which obtained permits to import more than 100 million rounds of the Russian- and Eastern European-made ammunition.

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A federal judge in Seattle has upheld a decision by the federal Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) to ban ammunition originally designed for AK-74 assault rifles.

The decision Wednesday by U.S. District Judge John C. Coughenour came in a lawsuit brought by Redmond-based P.W. Arms Inc., which obtained permits to import more than 100 million rounds of the Russian- and Eastern European-made ammunition known as 7N6. When the first shipments arrived in early 2014, the ATF deemed them “armor-piercing” and barred their importation for civilian resale.

The company said the agency misinterpreted the definition of armor-piercing bullets under federal law. But the judge disagreed, saying they contain a steel core and can be fired from a handgun.

Coughenour noted that P.W. Arms never disputed the bullets can pierce body armor, and he called the company’s arguments disingenuous.

Information in this article, originally published Aug. 10, 2016, was corrected Aug. 11, 2016. In a previous version of this story, The Associated Press erroneously reported the type of rifle that the ammo was originally designed for..