On Tuesday police charged a man with firing shots at three other men in Merrylands last month.
On May 22, two groups of men were fighting at Granville Park in Montrose Avenue, Merrylands.
A man then allegedly fired three shots from a handgun.
No one was hit by the round and the groups fled from the park.
Rosehill detectives established Strike Force Clung to investigate the incident.
As a result, police arrested a 19-year-old man in Parklea on Tuesday.
He was charged with using a firearm to cause grievous bodily harm and appears in Parramatta Local Court on June 26.