STATEN ISLAND, N.Y. -- Federal authorities say a man turned his New Dorp Beach home into a veritable arsenal by stockpiling a huge stash of assault-style guns and ammunition.

However, the defendant’s lawyer says his client is a hardworking carpenter who was merely storing his late grandfather’s collection.

Armed with a search warrant, agents from the federal Drug Enforcement Administration raided the home of Adam Rosa, 34, on the 100 block of Finley Avenue on Thursday at about 8:15 a.m.

Agents found at least 24 guns and numerous rounds of ammunition stored in the basement, attic and bedroom of the home where Rosa told authorities he had lived since November 2018, according to the criminal complaint.

The firearms included more than 20 rifles and shotguns, including military-style weapons such as a 7.62 SKS rifle semi-automatic with a detachable magazine and bayonet located inside a gun case in the attic, the complaint alleges.

Among the handguns was a semi-automatic Kel-Tec 9 mm pistol assault weapon with a folding stock and detachable magazine with 9 mm ammunition inside a safe in the basement, authorities said.

The attic was stocked with bullets in more than 15 calibers, feds allege.

Inside a safe in the rear bedroom, agents allegedly recovered a .44-caliber Ruger revolver, a .22-caliber Derringer pistol, a 12-gauge Mossberg shotgun and a .22-caliber Sovereign rifle. Ammunition stored on top of the safe included .380-caliber, 9 mm and .22-caliber cartridges, the complaint alleges.

Stashed in the attic inside gun cases were a .30-06 Savage Arms rifle, a .50-caliber Thompson Center rifle, a 7.62 Enfield MK1 Longbranch rifle, a .22-caliber Winchester rifle, a 12-gauge Mossberg shotgun, a .22-caliber Armscor rifle, a .50-caliber Investarm Spa rifle, a .32-caliber Winchester rifle, and a .50-caliber Connecticut Valley Arms rifle.

And recovered in a safe in the basement were two 12-gauge Mossberg shotguns, a .270-caliber Remington rifle, a .30-caliber Carbine rifle, a .44-40 Navy Arms rifle, a 20-gauge Universal shotgun, two Marlin rifles, and a .45-70 Poultney rifle.

The suspect did not have a permit or license to possess any of the guns or ammunition, according to the complaint.

Rosa, who as arrested during the raid, also had 16 oxycodone pills inside a rear bedroom in the upper level of the home, the complaint alleges.

ATTORNEY MAINTAINS INNOCENCE

However, defense attorney Allen Cappelli maintained his client’s innocence, saying the guns originally belonged to Rosa’s grandfather, who legally purchased them from a gun store on Forest Avenue.

“The DEA’s leak of this situation is disgraceful and contributed to what people in this country are disgusted with, which is fake news,” Cappelli said. “Adam Rosa is a respectable Staten Island business person. He was not charged with selling drugs."

Rosa “bought a house” and allowed another relative to store his deceased grandfather’s property, which included this gun collection, in his attic, the lawyer said.

“He supports several family members. This is all much ado about nothing. He is a carpenter and contractor. He does not have a criminal record and has no prior arrests," Cappelli said. "We will vigorously defend this case and I’m extremely disappointed in the leaks that came out of the federal government’s DEA. They should know better.”

Cappelli added, “This is a total smear job by the DEA.”

Rosa has been charged with numerous counts of criminal possession of a weapon, attempted criminal possession of a weapon, criminal possession of a firearm, attempted criminal possession of a firearm, disposition or purchase or possession of ammunition and feeding devices, unlawful possession or disposition of rifles or shotguns, possession of ammunition and criminal possession of a controlled substance.

Bond has been set at $150,000/$100,000 cash for the defendant, who is due back in Criminal Court on Oct. 29.