Users
- Argentina: Mk 4 variant.
- Bahrain: Mk 4 variant.
- Bangladesh: Mk 4 variant.
- Barbados
- Belize: Mk 4 variant.
- Botswana
- Brunei: Mk 4 variant.
- Canada: Produced as the C1.
- Cyprus
- Dominican Republic
- Gabon
- Gambia
- Ghana
- Guyana
- India: Currently manufactured by the Indian Ordnance Factories. It is sold as the Sub Machine Gun Carbine 9 mm 1A1. A silenced version is also available which sold under the label of Sub Machine Gun Carbine 9 mm 2A1.
- Iraq: Mk 4 variant.
- Jamaica: Used by the Jamaica Defence Force as a personal defense weapon for auxiliary units.
- Kenya
- Kuwait
- Lebanon
- Lesotho
- Libya: L34 variant.
- Malawi
- Malaysia
- Malta
- Morocco
- Myanmar
- Nepal
- Nigeria
- Oman
- Pakistan
- Papua New Guinea
- Philippines: L34A1s used by Naval Special Warfare Group.
- Portugal
- Qatar
- Sierra Leone
- Singapore: Mk 4 variant used by Singapore Police Force's paramilitary units — Gurkha Contingent, Police Coast Guard and Police Special Operations Command; replaced by the Heckler & Koch MP5 since 1999.
- Somalia
- Spain: UOE special group of the Spanish Navy.
- Sri Lanka
- Sudan
- Swaziland
- Tanzania
- Trinidad and Tobago
- Uganda
- United Kingdom: L2A1 variant was accepted by the British Army in 1953. L34A1 variant entered service in 1966.
- Zambia
- Zimbabwe
Read more about this topic: Sterling Submachine Gun