F rom 1818 to 1853 William Moore lived at Colchester Road, Edgeware, London. In 1820 he established his own business at that address, but by 1828 his trade had increased to the point where he required larger premises so he opened a new shop at 78 Edgeware Road.
In 1829 he also opened a stock making business at Court, 4 Whittall Street, Birmingham. This was also a purchasing office and finishing workshop.
In 1835 a percussion lock developed by Moore was rejected by the Board of Ordnance.
In 1838 William Moore and William Harris became partners in the firm of Moore & Harris, also at 35 Loveday Street, William Harris also traded from these premises in his own name (it is likely that William Harris was related to Alfred Harris who traded as a gun barrel maker in Birmingham).
In 1836 William Moore was appointed Gunmaker-in-Ordinary to King William IV, and in that year the name of the firm changed to William Moore & Co.
In 1854 the firm were appointed gunmakers to Prince Albert, the Prince Consort.
Also in 1837 the business at Court, 4 Whittall Street moved to 35 Loveday Street, it was recorded up to 1845.