Twenty-two-year-old Nathan Joseph pleaded guilty to the charge when he appeared at Lincoln Crown Court this morning (Tuesday).
Joseph, of no fixed address, denied the more serious offence of attempted murder. The pleas were accepted by the prosecution.
A 30-year-old man sustained head injuries following the incident at Ancaster Karting and Paintball, near Sleaford, on February 6.
Judge Michael Heath adjourned sentence for four weeks and remanded Joseph in to custody.