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Yep they all carry arms.
The Belfast harbour police is a private force with the right to carry arms, which is rather unique.
My only experience with them is when they went to the Audi garage to notify a test car had been driven at 80 in a 30 zone. My colleague overheard the garage owner bitching about it in the lunch queue.
Some iffy stuff happening sometimes, drugs etc. being smuggled into the port. Perhaps that's the reason they can bear arms if needed.
I imagine all PSNI cops are firearms officers as well so they would have the same level of expertise as ARV officers this side of the Irish Sea.