The man who threatened Rep. Steve Scalise and Rep. Cathy McMorris Rodgers last week allegedly had different types of ammunition, materials and instructions on how to build bombs.

The man, Carlos Bayon, 63, was charged by criminal complaint with interstate communication of a threat. Bayon left Scalise a message on June 30 claiming he would make the congressman “pay,” promising to feed him and the people that sent him to Washington “lead.” (RELATED: One Year After He Was Nearly Killed, Scalise Is Still Receiving Assassination Threats)

According to an affidavit filed in court, the search of Bayon’s house did not turn up any firearms. However, special agent Lawrence Anyaso said investigators discovered 150 rounds of 7.62-millimeter rifle ammunition, 50 rounds of shotgun ammunition, a 2004 receipt for an SKS assault rifle, and a 1987 receipt for a .38-caliber revolver, according to NOLA.com.

He was also in possession of over a dozen books about guns and how to make bombs. Some titles included “Ragnar’s homemade detonators,” “New & Improved C-4,” and “Improvised radio detonation technique.”

The congressman from Louisiana was shot and severely wounded last year when a lone gunman attacked the Republicans’ baseball team during one of their practices.

Scalise is currently the fourth ranking Republican in the House, and is one of the many congressmen who are expected to vie for the House Speaker vacancy come November.