- Tacfire
- TacStar
- Tact-Med
- Tactical Formulary
- Tactical Solutions
- Tagua
- Talley Manufacturing
- TALON Grips Inc
- Tanfoglio
- TangoDown
- Tannerite
- Taran Tactical Innovation
- Tasco
- TASER
- Taurus USA
- Techna Clip
- TekMat
- Thompson
- Tiger Rock
- Tikka
- Timney Triggers
- Tippmann Arms Company
- Tipton
- Tokarev Shotguns
- Toolman Tactical
- Torkmag
- Tornado Personal Defense
- TPS Arms
- TriggerTech
- Trijicon
- Tristar
- Troy
- TROY Industries
- True Precision
- TruGlo
- TulAmmo
- Tyrannical Targets
- Tyrant
- Tyrant CNC
- Ultradot
- Ultradyne USA
- Umarex
- Uncle Mike's
- Unity Tactical
- US Government
- US Optics
- US Palm
- US PeaceKeeper
- UST - Ultimate Survival Technologies
- UTG