Brands
- Heckler & Koch
- Henry
- Heritage
- Herters
- Hi-Point
- Hi-Viz
- HM Defense
- Hodgdon
- Hogue
- Holosun
- Hoppe's
- Hornady
- Howa
- HSM
- Huntertown Arms
- Huxwrx
- I.O. Inc
- IMR
- Inline Fabrication
- Iver Johnson
- IWI
- JK Armament
- JP Sauer & Sohn
- JTS Group
- KAK Industries
- Kalashnikov USA
- KCI
- KE Arms
- Kel-Tec
- Keystone Sporting Arms
- Kimber
- Kleen-Bore
- Knights Armament
- Kovea
- KRISS
- L.A.G. Tactical
- L.E. Wilson
- LabRadar
- Lake City
- Landor Arms
- LanTac USA
- Lapua
- Larue Tactical
- Lawrence
- LBE Unlimited
- Lee
- Lehigh Defense
- Leupold
- Liberty Ammunition
- Liberty Suppressors