The accused was entering Canada on his way to Alaska and allegedly told border officers he was carrying seven rifles and a handgun.
However a search of his vehicle found three more handguns and an additional five rifles.
CBSA's regional director, Lauren Delgaty, calls it a significant seizure and the largest at Coutts this year.
Rickey Paul Mackey has been charged with smuggling and making false statements under the Customs Act and unauthorized importation of a firearm under the Criminal Code.
His next appearance is scheduled for Oct. 7 in Lethbridge provincial court.
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