LOS ANGELES – Sylvester Stallone and his beefy buddies have muscled their way to the top of the weekend box office.

Stallone's action hero roundup "The Expendables 2" debuted at No. 1 with $28.8 million, according to studio estimates Sunday. That's down from the $34.8 million start for "The Expendables" two years ago.

The Lionsgate sequel elbowed out another action tale as Universal's "The Bourne Legacy" fell to No. 2 in its second weekend with $17 million. That was a steep 55 percent drop from its $38.1 million opening weekend, though the movie's domestic total climbed to a solid $69.6 million.