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1) Government Operated Facilities
- Royal Ordnance Factory – Woolwich Arsenal – Woolwich, Kent
- Royal Small Arms Factory – Sparkbrook, Birmingham, Warwickshire
- Royal Army Clothing Department – Pimlico, London, Middlesex
- Royal Small Arms Repair Factory – Pimlico, London, Middlesex
- British Small Arms Factory, Birmingham, Warwickshire
- R.O.D. Weedon – Weedon Bec, Northamptonshire, England.
- Chemical Defence Experimental Establishment – Porton Down, Wiltshire
2) Private Companies & Contractors
- Gregory Browne, Woolwich, Kent, England
- Gregory Kane, Dublin, County Dublin, Ireland
- William Day, London, Middlesex, England
- Thomas Stokoe, Hay-on-Wye, Breconshire, Wales
- William Miller Limited, Portsea, Hampshire, England
- Enderley Mills, Newcastle-under-Lyme, Staffordshire, England
- Maxim Gun Company, London, Middlesex, England
- Vicker, Sons & Maxim, Various Operating Facilities within Great Britain
- Vikers Limited,Various Operating Facilities within Great Britain
- Vickers-Armstrong Limited, Crayford, Kent, England
- Kynoch & Company (plus Kynoch Limited):
- The National Explosives Company Limited, Hayle, Cornwall
- The British & Colonial Explosives Co. Ltd., Perranporth, Cornwall
- Greenwood & Batley Limited – Leeds, Yorkshire, England