The same company name was used during World War I to import arms from America such as the Colt New Service Revolver in 455 Eley.

Kerr, a former foreman at Deane Brothers, made improvements to the Enfield 1853 pattern rifled musket which the Armoury was manufacturing under contract.

Production of the new revolver began in April 1859, but the company was not able to obtain a contract for it from the British government and civilian sales were modest.

Two years later Confederate arms buyers Major Caleb Huse and Captain James Bulloch contracted for all the rifles and revolvers the Armoury could produce.

The Confederacy was now the London Armoury Company's principal client and it manufactured and shipped more than 70,000 rifles and about 7,000 revolvers (out of a total production run of about 10,000) to the South.