Detectives found a cache of guns at A$AP Rocky's Los Angeles, CA mansion after he was arrested at LAX on 4/20.
While A$AP was in custody, cops executed a search warrant to seize the gun that was used to shoot a man during an argument in Hollywood last year.
Law enforcement sources tell TMZ that detectives will run ballistic tests on the weapons to determine if one of his guns was used in the shooting.
Cops will also determine if the firearms are legal, who bought them, or if they'd been reported stolen.
Parents-to-be Rihanna and A$AP Rocky stepped out for dinner at Giorgio Baldi in Santa Monica, days after his arrest. The two were seen arriving for their baby shower dinner with friends and family.
Rihanna's feet and ankles looked swollen and she appeared to be upset days after her baby's father was arrested for shooting a man. How embarrassing for the mother-to-be.
RELATED: A$AP Rocky ARRESTED at LAX After Vacationing with Rihanna in Barbados
As TMZ reported, Rocky was arrested at a private LAX terminal last week when he and Rihanna returned from their vacation in her native Barbados. He posted bond on the same day.
Rocky, who was born Rakim Athelaston Mayers, was booked for assault with a deadly weapon after a man told police the rapper shot at him multiple times and a bullet gazed his hand last November.
Rocky and his legal team told TMZ they were shocked by his arrest and his alleged involvement in the shooting. Police said they snatched him off the private jet because they needed the element of surprise to search his house for the weapon.
Video shot by BACKGRID.com shows police carrying boxes across the street from Rocky's house. Homeless tents are seen in the video just steps from Rocky's privacy gate.