- IWI
- Juggernaut Tactical
- Just Right Carbines
- KABAR
- Kagwerks
- Kahr Arms
- Kalashnikov
- Kalikey
- Kanik
- KAOS Concealment
- KCI
- Kel-Tec
- Kershaw
- Keystone Sporting Arms
- Kimber
- Knights Armament Company
- KORE Essentials
- Kriss USA
- Lancer
- LanTac USA LLC
- LBE Unlimited
- Leisure Carry
- Les Baer
- Leupold
- LIVE FIT
- Live Free Armory
- LMT
- Lone Wolf "LWD"
- Lorcin
- Lucas Oil
- Luth-AR
- LWRC
- Mace Security International
- Maglula ltd.
- Magnum Research
- MagPod
- Magpul Industries
- Magtech Ammunition
- Marconi Armory
- Marlin
- MasterLock
- Mauser
- MAXSafes
- Mec-Gar
- Meprolight
- Midwest Industries
- Military Systems Group
- Mission First Tactical
- Mossberg
- Namaste Arms