- Spike's Tactical
- Springfield
- Spyderco
- Stag Arms
- Standard Manufacturing Company
- Stars and Stripes
- Steiner
- Stevens
- Sticky Holster
- Streamlight
- Strike Industries
- STV Technology
- Surefire
- Sylvan Arms
- Tacfire
- Tact-Med
- TALON Grips
- TangoDown
- Tannerite
- Tapco
- Taran Tactical Innovations "TTI"
- Taurus
- TekMat
- Thompson
- Tiger Rock
- Timney
- Tipton
- Toolman Tactical
- Torkmag
- Trijicon
- Tristar
- Troy
- True Precision
- TruGlo
- TulAmmo
- Tyrannical Targets
- Tyrant
- Unity Tactical
- US Government
- UTG
- Vector
- Velocity
- Venom
- Vertx
- VG6
- Viridian Weapon Technologies
- VISM
- VLTOR
- Vortex Optics
- VZ Grips