Robert Stack was a TV star, but he was also a shooting star.

Besides his Hollywood career, the late star of "Unsolved Mysteries" and "The Untouchables" had a passion for shooting and golf.

Stack was a skeet champion with several world records and was inducted into the National Skeet Shooting Hall of Fame in 1971.

His gun collection and other personal items will be up for bids during an auction Sunday and Monday at the Phoenix Club in Anaheim, Calif., being conducted by Little John's Auction Service, which the actor's estate contacted after his death in May at 84.

"Outside of the shooting community, it is a little known fact that Bob was a shooting champion, held numerous world records in shooting sports and was the National Skeet Shooting runner-up — far before his role as Elliot Ness. Shooting was his first and true passion in life," said publishing magnate Robert E. Petersen, Stack's longtime friend and shooting partner.

Items on the auction block include his Parker BHE Skeet Grade 28 gauge SXS shotgun with a brass inlay inscribed "National Skeet Championship 1936, 20 ga. Runner-Up, Bob Stack, Score 97x100"; a Ruger 20 gauge over/under shotgun presented to Stack by company founder William B. Ruger and the factory inscription "To Robert Stack from William B. Ruger, 1978"; and Stack's shooting jacket with various team, tournament and police patches.

The auction will feature $10 million worth of antique and sporting arms, including collections from Petersen, Barry Goldwater Sr. and Michael Wayne, the son of John Wayne and producer of films including "The Green Berets," "Big Jake" and "McQ."