- PMC
- Polymer80
- Powder River Precision
- PowerBass
- PPU
- Primary Arms
- Primary Weapon Systems
- ProMag
- Prvi Partizan
- PS Products
- PTR
- Q
- Quarter Circle 10
- Radian Weapons
- Real Avid
- Red Eye Targets
- Remington
- Reptilia
- Rifle Supply
- Riley Defense
- Rio
- Rise Armament
- Riton Optics
- Rival Arms
- Rosco Manufacturing
- Rossi
- Ruger
- Rugged Suppressors
- Sabre
- Safariland
- San Tan Tactical
- Savage
- Savior Equipment
- Say Again Over
- SB Tactical
- Seahorse
- Seekins Precision
- Sellier & Bellot
- SGM Tactical
- Sharps Bros
- Shield Arms
- Sierra Outdoorsman
- Sig Sauer
- Sightmark
- SilencerCo
- Smith & Wesson "S&W"
- SnapSafe
- SOG
- Sons of Liberty Gun Works
- Speer Ammunition