Biden was joined Monday at Girard College by law enforcement officials, U.S. Deputy Attorney General James Cole and Democratic members of Pennsylvania's congressional delegation.
Biden says things like universal background checks for gun purchases have widespread support.
The Obama administration is pushing for new gun-control measures in the wake of the school shooting in Newtown, Conn., on Dec. 14.
Proposals include a new ban on assault weapons, a ban on high-capacity magazines carrying more than 10 rounds of ammunition, and background checks for all gun sales.
Federal lawmakers joining Biden included Reps. Bob Brady, Chaka Fattah and Allyson Schwartz, and Sen. Bob Casey.