Clint Eastwood'sAmerican Sniperis smashing records at the North American box office, where it's now projected to earn $75 million or more over the long Martin Luther King weekend, notably more than expected.That would mark the largest opening of all time for the month of January, as well as one of the top openings ever for an R-rated title, not accounting for inflation. To boot, it would be the No. 2 opening for a winter release afterMel Gibson'sThe Passion of the Christ($83.8 million). Friday's take alone was an estimated $28 million-$30 million, including $5.3 million from late-night Thursday runs.