About 9:30 p.m., four men were working on a yard in Rush Valley for an upcoming wedding when the conversation turned to guns, Tooele County Sheriff's Department Sgt. Jason Sparks said.

The homeowner has an extensive gun collection, Sparks said, and he brought out a .45-caliber Springfield model 1911 handgun. A 66-year-old guest from out of state slid the rack back as he looked at the weapon.

The guest, who holds a concealed weapons permit, checked if the gun was loaded, Sparks said, but did not see a bullet in the magazine.

Sliding the rack raised the hammer, and to drop it, the man had to pull the trigger. When he did, the bullet shot from the gun and hit the 41-year-old Herriman man in the back. He was pronounced dead at the scene.

Police did not release the name of either man, and are investigating to decide whether charges should be filed. The two men knew each other, Sparks said. Their children are friends.

Rush Valley is located about 10 miles south of Tooele.