An Enfield L85A1
The Enfield L85A1 was a service rifle used on Earth in the 21st century.
In 2024, some of the service members assigned to National Guard units mobilized to San Francisco's Sanctuary District A were armed with Enfield L85A1s outfitted with SUSAT (Sight Unit Small Arms, Trilux) optical scopes. (DS9: "Past Tense, Part II")
The Enfield L85A1 is a variant of the SA80.