A series of patrols and exercises in the Northern Division on Friday afternoon led to the seizure of an assault rifle, a pistol and the arrest of four people.
Police said they found an AR 15 in Carapo.
A man was also held with a pistol at the La Horquetta football grounds.
Two people, including a murder suspect, were also arrested in an unrelated incident.
Police said 36 tickets were also issued during a traffic exercise that afternoon.
The exercise was co-ordinated by Snr Supt Paponette and Supt Edwards and led by ASP Etienne, Insp Pitt with supervision from Sgt Nicome and Cpl Durity.