Narcotics detectives from Wilkinsburg said they seized $8,000 worth of heroin from a Hill Avenue apartment Thursday night.
Investigators said they also recovered two assault rifles, five handguns, and $8,400 in cash.
Police arrested Robert Thomas, Cheron Shelton, Aymund Knight and Justin Gomez.
All four men are facing drug charges.
$8K in heroin seized from Wilkinsburg apartment; 4 arrested
Child killed, another injured in pit bull attack
Ho, ho, ho: Santa makes virtual stop at Children's Hospital of Pittsburgh
Amazon.com scam hits shoppers before holidays
Woman caught on camera stealing Salvation Army kettle at Waycross Walmart