- ProMag
- ProMag Industries
- Prvi Partizan
- PS Products
- PTR Industries
- Pulsar
- Q
- Quake
- Radian Weapons
- Radians
- Radical Firearms
- Rapid Force
- Raven Concealment Systems
- RCBS
- re:do
- Real Avid
- Rearden
- Red Eye Targets
- Remington
- Reptilia
- Rifle Supply
- Riley Defense
- Rio
- Rise Armament
- Riton Optics
- Rival Arms
- Rock River Arms
- Rosco Manufacturing
- Rossi
- Rost Martin
- RS Regulate
- Ruger
- Rugged Suppressors
- Sabre
- Safariland
- Samson Manufacturing Corp.
- San Tan Tactical
- Savage
- Savage Arms
- Savior Equipment
- Say Again Over
- SB Tactical
- SCCY
- Seekins Precision
- Sellier & Bellot
- SGM Tactical
- Shadow Systems
- Sharps Bros.
- Shield Arms
- Shield Sights