The Emergency Response Unit and local armed detectives are on the streets of the Drimnagh-Crumlin areas of south Dublin.
The move comes after a man was hit a number of times in a drive-by shooting in Knocknarea Road, Drimnagh, early on Monday evening.
The 34-year-old received injuries to his stomach and was operated on yesterday to remove the bullets.
Gardaí said the man will survive. A second person was seriously injured but is also expected to live.
Detectives believe the shooting is part of a long-running feud between two local gangs, and fear further violence.
“There will be a lash back, there’s no doubt about that,” said one garda source.
Operation Anvil, set up to target gun crime in Dublin, is being used to boost patrols and surveillance in the area.
Sources said the man injured on Monday was not high up in the Rattigan crime gang, but that two of his brothers are.
One of his brothers miraculously escaped injury on March 1 despite being shot at six times on Cooley Road, Drimnagh.
A member of the rival gang, whose brother was murdered in the feud, was shot on July 26 in Clondalkin and received injuries to his nose.
These tit-for-tat shootings follow the murder of Rattigan gang member John Roche on March 9 last.
The 25-year-old was shot dead in revenge for the murder of Declan Gavin in Crumlin in 2001.
Another member of the Rattigan gang, Joseph Rattigan, was shot dead in Drimnagh in July 2002.
A man was charged earlier this year over Gavin’s murder. No one has been charged yet with Roche’s murder.