BENTON, Mo. (AP) – A man has been charged after police say he used a handgun as a hammer while working on a project at a southeast Missouri elementary school.

A probable-cause statement from the Scott County Sheriff’s Department said that 45-year-old Jeffrey Grubbs was volunteering at a 4-H event Monday at Kelly Elementary School in Benton, when he gripped the handgun’s barrel and used the butt of the weapon to drive a thumbtack into a wood plaque.

The Southeast Missourian (http://bit.ly/1SiEtgw ) reports that Grubbs was arrested and released Tuesday. He has been charged with unlawful use of a weapon and child endangerment.

Police say Grubbs has a concealed-carry permit, but it’s illegal to bring a gun onto school property without consent from a school official.

Attempts by The Associated Press to reach an attorney listed as representing Grubbs were unsuccessful.