Heritage Open Day: Grade II listed arms factory closed to public for 170 years. Today the site forms the commercial centre of Enfield Island Village. Our museum, the RSA Interpretation Centre and clock tower are open for tours. Originally owned by the Royal Ordnance, the Royal Small Arms site was a famous centre for firearms manufacture for more than 170 years and was home to a whole community. Buildings on site included a church (the original font is displayed in the central courtyard at the Centre) a police station and a school.