- Grayguns
- Grey Ghost Gear
- Grey Ghost Precision
- Griffin Armament
- Grind Hard
- Grip Pod
- GrovTec
- Gun Storage Solutions
- GunfightersINC
- GunMate
- Gunslinger Armory
- Guntec
- GunVault
- Gunwerks
- Haley Strategic Partners
- Halo Optics
- Harris Engineering
- Havalon
- Heckler & Koch
- Heckler & Koch "HK"
- Henry Repeating Arms
- Hera USA
- Heritage Rough Rider
- Hexmag
- Hi-Point Firearms
- Hi-Viz
- High Speed Gear
- Hiperfire
- HKS Speed Loaders
- Hogue
- Holosun Technologies
- Hoppe's
- Hornady
- Howard Leight
- HUXWRX Safety Company
- INFORCE
- IRAYUSA
- IWI US, Inc
- Johnny Glocks
- JTS Group
- Juggernaut Tactical
- KA-BAR Knives
- Kagwerks
- Kahr Arms
- KAK Industry
- Kalashnikov
- Kalikey
- KAOS Concealment
- KCI
- KCI USA