S
- SA
- safety, automatic
- Savage Model 10 (rifle)
- Savage Model 99 (rifle)
- schnabel
- Science of Gunnery, The (book)
- screw in choke
- shotgun
- shot, balled
- shot, fused
- SIG SAUER P226 (pistol)
- SIG SAUER P320 (pistol)
- sight in
- sight, aperture
- sight, bar
- sight, iron
- Sight PRO (MGW sight pusher)
- single-action
- single-action trigger
- slave pin
- Smith & Wesson M&P 15-22 (rifle)
- Smith & Wesson M&P 15-22 Sport (rifle)
- Smith & Wesson Model 642 (revolver)
- Smith & Wesson Registered Magnum (revolver)
- SOT
- Special Occupational Taxpayer
- Sportsman 48 (Remington shotgun)
- standard Invector choke tubes
- Stevens Model 512 Gold Wing (O/U shotgun)
- Steyr-Solothurn MP34 (submachine gun)
- Stop (Frommer Stop pistol)
- strap, back
- subcaliber tube
- Superposed (Browning O/U shotgun)
- Swiss Vetterli rifle