Greenville County deputies responding to an overdose call Monday night found and seized 100 firearms, a pound of fentanyl, a makeshift drug press, and other narcotics, according to a statement from the Greenville County Multi-Jurisdictional Drug Enforcement Unit.

Paramedics and deputies Monday night went to a residence on Pinehill Drive in Travelers Rest after receiving reports of an overdose. When they arrived, deputies found a man who was unresponsive and began CPR until paramedics administered naloxone, an emergency overdose drug, successfully reversing the overdose.

Noticing narcotics and drug paraphernalia at the scene, deputies obtained search warrants for the residence and contacted the Drug Enforcement Unit.

Upon searching the residence, investigators found 100 guns, a pound of fentanyl, several ounces of meth, and liquid meth, as well as the homemade drug press, the statement said.

Roughly 2 milligrams of fentanyl — a synthetic opioid about 100-time stronger than morphine — is considered a potentially lethal dose to an adult male, according to the U.S. Drug Enforcement Administration. There are 453,592 milligrams in a pound.

Larry Ray Fagan, 51, was arrested and charged with multiple drug and gun charges in relation to the seizure.

Bart McEntire, commander of the Drug Enforcement Unit, said three of the seized guns had been reported stolen and US Bureau of Alcohol, Tobacco, Firearms and Explosives is tracing the other guns to determine were they came from.

Investigators found the collection of firearms — an assortment of handguns, shotguns, and assault-style rifles — stored in three different rooms in the house.

He said the press found at the Pinehill Drive residence is the fourth such narcotics manufacturing operation the unit has found this year.

"It seems to be a trend right now," he said.

McEntire said about a dozen investigators with the unit recently went through hazardous materials training to learn how to safely process the clandestine drug labs.

Conor Hughes is a public safety reporter with The Greenville News. Contact him via email at chughes@gannett.com or on Twitter @ConorJHughes.