A fierce political battle is emerging over how Americans buy their guns.A move by Visa and other major credit card companies to identify purchases at gun stores has inflamed Republican lawmakers, who warn that it will lead to widespread corporate surveillance and the suppression of Second Amendment rights. And they’re poised to make a campaign issue out of it.The new merchant code would identify retailers that primarily sell firearms and ammunition. While it stops short of pinpointing what’s been purchased, Democrats and activists pushing for gun restrictions say it will help law enforcement spot suspicious transactions that contribute to mass shootings and illegal firearms trafficking.

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