Just a high level list of gun manufacturers world wide.
Company / Country
Accuracy International
UK
Air Weapons Complex (AWC)
Pakistan
Alexander Arms
USA
Antonov
Ukraine
Alliant Techsystems
USA
Arcus Co.
Bulgaria
Aquarius International
PAK
Aquarius International
AUS
Aquarius International
SG
Arab Organization for Industrialization
Egypt
Areios Defense
Canada
ArmaLite
USA
Armi Jager
Italy
Armament Technology
Canada
Armscor
Philippines
Arsenal Corporation
Bulgaria
Arsenal, Inc.
USA
Astra Arms
Switzerland
Kiev Arsenal
Ukraine
ASELSAN
Turkey
Atlas Elektronik
Germany
Avibras
Brazil
BAE Systems
UK
BAE Systems AB
Sweden
Baikal
Russia
Bangladesh Ordnance Factories
Bangladesh
Barrett Firearms Manufacturing
USA
Bazalt
Russia
Benelli
Italy
Beretta
Italy
Bharat Dynamics
India
Bharat Earth Movers Limited
India
Bharat Electronics Limited
India
Birmingham Small Arms Company
UK
BMC
Turkey
Boeing Defense, Space & Security
USA
Browning Arms Company
Belgium
Bushmaster Firearms International
USA
Caspian Arms Ltd
USA
Chaiseri Metal & Rubber
Thailand
Charles Daly
USA
Charter Arms
USA
CheyTac
USA
Colt Canada (formerly Diemaco)
Canada
Colt's Manufacturing Company (CMC)
USA
Companhia Brasileira de Cartuchos (CBC)
Brazil
Česká Zbrojovka Strakonice
Czech Republic
Česká Zbrojovka Uherský Brod
Czech Republic
Defense Industries Organization
Iran
Degtyarev Plant
Russia
Denel
South Africa
Denel Dynamics
South Africa
Detonics
USA
Diehl BGT Defence
Germany
Doosan DST
South Korea
EADS
Europe
EAS
Greece
Elbit Systems
Israel
Embraer
Brazil
Fábrica de Armas Halcón
Argentina
Fabrique Nationale (FN)
Belgium
Fabryka Broni "Łucznik" - Radom
Poland
FAMAE
Chile
FAMARS
Italy
Federal Cartridge Company
USA
Fegyver- és Gépgyár (FEG)
Hungary
Ferfrans
Philippines
Finmeccanica
Italy
Floro International Corporation
Philippines
General Dynamics
USA
Nexter (formerly GIAT Industries)
France
Glock Ges.m.b.H.
Austria
Grand Power
Slovakia
Hanwha
South Korea
HAVELSAN
Turkey
Heavy Industries Taxila
Pakistan
Heckler & Koch (H&K)
Germany
Henry Repeating Arms
USA
Hispano Argentina Fábrica de Automóviles
Argentina
Helibras
Brazil
Hi-Point Firearms
USA
Hindustan Aeronautics Limited
India
Holland & Holland
UK
Howaldtswerke-Deutsche Werft (HDW)
Germany
HS Produkt
Croatia
Hyundai Rotem
South Korea
IBRAP
Brazil
Iran Aviation Industries Organization
Iran
Iran Electronics Industries
Iran
IMBEL
Brazil
INDEP
Portugal
Indumil
Colombia
Innalabs
Ireland
Insys
UK
Israel Military Industries (IMI)
Israel
Israel Weapon Industries (IWI)
Israel
Israel Aerospace Industries (IAI)
Israel
Izhevsk Mechanical Plant
Russia
Izhmash
Russia
James Purdey and Sons Ltd.
UK
JP Enterprises Inc
USA
Kahr Arms
USA
KBP Instrument Design Bureau
Russia
Kel-Tec CNC Industries Inc
USA
Kharkiv Morozov Machine Building Design Bureau
Ukraine
Kimber Manufacturing
USA
Klimovsk Specialized Ammunition Plant
Russia
Knight's Armament Company (KAC)
USA
Kongsberg Defence & Aerospace
Norway
Korea Aerospace Industries (KAI)
South Korea
KAL-ASD
South Korea
Krauss-Maffei Wegmann (KMW)
Germany
Land Warfare Resources Corporation (LWRC)
USA
Les Baer
USA
LFK
Germany
LIG nex1
South Korea
Lockheed Martin
USA
Franchi
Italy
Lürssen
Germany
Magnum Research Inc. (MRI)
USA
Mechanical and Chemical Industry Corporation (MKEK)
Turkey
Manroy Engineering Ltd.
UK
Manroy USA
USA
MasterPiece Arms
USA
Mauser
Germany
Marlin Firearms
USA
Matra BAE Dynamics Alenia (MBDA)
France
McBros Rifles
USA
Miguel Enrique Manzo Sal (MEMS)
Argentina
Metal Storm
Australia
Malyshev Factory
Ukraine
Nammo
Norway
National Organization of Military Industry
Egypt
National Service Products Organization
Egypt
Norinco
China
Northrop Corporation
USA
Norton Firearms, Inc
USA
O.F. Mossberg & Sons
USA
Oerlikon Contraves
Switzerland
Olympic Arms
USA
OMI Ordtech Military Industries
Greece
Ordnance Factories Board
India
Otokar
Turkey
Pakistan Aeronautical Complex (PAC)
Pakistan
Pakistan Ordnance Factories (POF)
Pakistan
Para-Ordnance Manufacturing Inc
Canada
Patria
Finland
Productos Mendoza
Mexico
Pindad
Indonesia
Rafael Advanced Defense Systems (Rafael)
Israel
Rangemaster Precision Arms
UK
Remington Arms (Remington)
USA
Rheinmetall AG (Rheinmetall)
Germany
RND Manufacturing
USA
Rock River Arms
USA
ROKETSAN
Turkey
Romtehnica
Romania
Rosoboronexport
Russia
Royal Ordnance
UK
Royal Aquarius Defense Industries
USA
RPC Fort (Fort)
Ukraine
S&T Daewoo
South Korea
SENTINEL WEAPON'S INDUSTRIES
INDIA
Saab AB
Sweden
SAKO
Finland
Samsung Techwin
South Korea
Savage Arms
USA
Sellier & Bellot
Czech Republic
Scientifical Technical Center Delta
Georgia
Serbu Firearms
USA
Sharps Rifle Manufacturing Company
USA
Smith & Wesson (S&W)
USA
Springfield Armory (former U.S. Army arsenal)
USA
Springfield Armory (modern company)
USA
Sphinx Systems Ltd.
Switzerland
Sterling Armaments Company
UK
Steyr Mannlicher (Steyr)
Austria
ST Engineering
Singapore
STI International
USA
Stoeger Industries
Italy
Strayer Voigt Inc
USA
Sturm, Ruger, & Co. (Ruger)
USA
Swiss Arms
(US subsidiary known as SIG Sauer)
Switzerland
Thai Aviation Industry
Thailand
THOR Global Defense Group
USA
TsNIITochMash
Russia
Thompson
USA
Turkish Aerospace Industries (TAI)
Turkey
Taser International
USA
Forjas Taurus (Taurus)
Brazil
Tbilisi Aircraft Manufacturing
Georgia
TEREM
Bulgaria
Textron Systems (Textron)
USA
Thompson Center Arms (Thompson Center)
USA
Thales Group (Thales)
France
ThyssenKrupp
Germany
United Defense Manufacturing Corporation (UDMC)
Philippines
U.S. Fire Arms Manufacturing Company (U.S. Fire Arms Mfg. Co.; USFA)
USA
U.S. Repeating Arms Company (USRAC)
Belgium
Uralvagonzavod (UVZ)
Russia
Winchester Repeating Arms Company
Belgium
Walther
Germany
Webley & Scott
UK
W. W. Greener
UK
Valmet
Finland
Yuzhnoye Design Bureau
Ukraine
Zastava Arms
Serbia