I presume the image referred to by the Deputy is that of a person with a firearm on a firing range.
I am informed by the Garda authorities that the web site page in question, titled "Recruitment", refers to "student selection and training, promotion and development courses, and education within the service." The page ends with reference to specialist services within An Garda Síochána, which include ballistics and units to deal with armed terrorists and criminal gangs. The majority of members of the Garda Síochána have undergone firearms training.
Several images are used in the web site page and the image referred to by the Deputy illustrates just one aspect of the organisation and should not be taken in isolation.