BENTON HARBOR, Mich. — A man who kidnapped the manager of a Michigan sporting goods store and held him at gunpoint while an accomplice stole 123 handguns was sentenced Monday to 15 years in federal prison.

The Dunham’s Sports manager was handcuffed and blindfolded outside his home last November and forced to reveal how to disarm the alarm at the big-box store near Benton Harbor, 100 miles east of Chicago.

Dontrell Nance, 25, was given consecutive sentences for kidnapping and brandishing…