LOS ANGELES (CBSLA.com) — A Los Angeles man pleaded no contest Tuesday to three felony counts stemming from a traffic stop in which an explosive device was found in his vehicle.

After further investigation, authorities found additional bomb-making materials in his apartment in the Palms area.

Robert Colt Wilson, 29, was sentenced to eight years in state prison following his plea to one count each of possession of the ingredients to make a destructive device, possession of a destructive device on the street and possession of a controlled substance with a firearm.

Four additional counts against Wilson have been dismissed.

Wilson was originally arrested on May 14 during a traffic stop in the 4100 block of Glencoe Avenue, which is east of Marina del Rey. During the traffic stop, authorities discovered an explosive device in his vehicle.

According to the District Attorney’s Office, a bomb squad subsequently found an explosive device, as well as bomb-making materials in Wilson’s apartment in the 3800 block of Overland Avenue, near Venice Boulevard.

(©2013 CBS Local Media, a division of CBS Radio Inc. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. Wire services contributed to this report.)