F
- Federal Firearms License
- Federal Firearms Licensee
- feed mechanism, automatic
- FFL
- Fieldmaster (Remington Model 121 rifle)
- Firearms Technology Branch
- firing-pin protrusion
- FMC
- FMJ
- fore-end, Anson fastening
- Frank Baughman
- Frommer Stop (pistol)
- front sight, Baughman
- FTB
- full jacketed projectile
- full metal case
- full metal jacket
- fused shot