These guns have been taken off the streets following searches in west Belfast.
The PSNI published pictures of the three handguns on Wednesday.
The handguns were found during a search in the Lagmore area by the PSNI's Belfast District Support Team.
They have been taken away for further examination.
Detective Inspector Andrew Hamlin from the Terrorism Investigation Unit said: “The seizure of these suspected firearms demonstrates our commitment to removing harm from our community and I would encourage anyone with information regarding criminality to contact police on 101.
"Alternatively, information can be provided to the independent charity Crimestoppers on 0800 555 111 which is 100% anonymous and gives people the power to speak up and stop crime.”
The four people who were arrested on suspicion of possessing firearms following the discovery - two women, aged 24 and 55, and two men, aged 55 and 20 - have been released on bail pending further enquires. The 20-year-old man is to be reported to the Public Prosecution Service for Possession of a Class B controlled drug.