Why are you surprised ? They are still low powered airguns so they are on a AWL . Once over 12 ft lbs they are FAC as they are in England and Wales . Northern Ireland puts airguns over a certain limit on FAC over there (energy in excess of one (1) Joule (0.737 ft lbs) and then there is no limit on power.
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Airguns not Requiring a Firearm Certificate
In Northern Ireland airguns and CO2 guns having a discharge kinetic energy in excess of one (1) Joule (0.737 ft lbs) require to be held on a firearm certificate.