Four suspected guns were discovered in a car in Carrickfergus, police said on Sunday morning.
Detectives in Newtownabbey have charged three men aged 29, 33 and 35 with assault and disorderly behaviour following an altercation connected to the incident.
It happened in the Minorca Place area of the town, which stands close to the large Tesco store, on Saturday.
All three men are due to appear at Belfast MC on Thursday, March 12.
A 24-year-old man, arrested in relation to this incident, remains in custody as of Sunday morning helping police with their enquiries.
Also in Carrickfergus, police are investigating an arson attack at a house in Edenvale Avenue, at the northern end of the town, late on Friday evening.
Detective Inspector David Skelly said: “It was reported to police that at around 11.30pm, a petrol bomb was thrown at the front door of a house in the area.
“The door was set alight and the two occupants, a woman in her 30s and a boy, were assisted to safety by neighbours.
“Two males were seen making off in the direction of a nearby primary school where they are believed to have driven off in a small dark coloured car in the direction of Trailcock Road. One of the males wore a green Parka style coat with fur trimmed hood and the other, a hooded top. Both were described as being less than 5’10” tall and of slim build.”
There were no injuries.
The police said the incidents on Friday and Saturday were unconnected.