History of the Metropolitan Police Service by the end of the 19th century. During the 1860s, the flintlock pistols that had been purchased in 1829 were decommissioned from service, being superseded by 622 Beaumont–Adams revolvers firing the .450 cartridge which were loaned from the army stores at the Tower of London following the Clerkenwell bombing. In 1883, a ballot was carried out to gather information on officers' views on whether they wished to be armed, and 4,430 out of 6,325 officers serving on outer divisions requested to be issued with revolvers. The now obsolete Adams revolver was returned to stores for emergencies, and the Bulldog 'Metropolitan
Metropolitan Police Service which patrolled a number of Greater London's major parks, was merged with the Metropolitan Police in 2004, and those parks are now policed by the Royal Parks Operational Command Unit. There is also a small park police force, the Kew Constabulary, responsible for the Royal Botanic Gardens, whose officers have full police powers within the park. A few London borough councils maintain their own borough park constabularies, though their remit only extends to park by-laws, and although they are sworn as constables under laws applicable to parks, their powers are not equal to those of constables appointed under the Police