- Earmor
- Ed Brown
- Edgar Sherman Design
- Elftmann Tactical
- Elite Tactical Systems Group
- Elite Tactical Systems Group "ETS"
- Energetic Armament
- Eotech
- Ergo Grip
- European American Armory
- Eva-Dry
- Evolution Outdoor
- Exothermic Technologies
- F.A.B. Defense
- FailZero
- Faxon Firearms
- Federal
- Fime Group
- Fiocchi
- Firearm Safety Devices Corporation
- Firefield
- FK BRNO
- FMK Firearms
- FN America
- Fobus
- Fortis Manufacturing, Inc.
- Frankford Arsenal
- Franklin Armory
- Freedom Ordnance
- FrogLube
- Frontier Cartridge
- FSDC
- Full Forge Gear
- G-Code
- G2 Research
- Galco Gunleather
- Gamo USA
- Garmin
- GBRS Group
- Geissele Automatics
- Gemtech
- German Sports Guns
- GG&G, Inc.
- Ghost Inc.
- Girsan
- Global Ordnance
- Glock
- Golden State Arms
- GPS
- Grand Power