- CAA Tactical
- Cabot Guns
- Caesar Guerini
- Caldwell
- Canik
- Carl Zeiss Sports Optics
- Chiappa Firearms
- Clothing
- Cold Steel
- Colt
- Coltellerie Maserin
- Combination rifle
- Concern Kalashnikov
- Crimson Trace
- Crispi
- CRKT
- Crosman
- Crye Precision
- Culture
- Cybergun
- CZ (Česká Zbrojovka)
- Consorzio Coltellinai di Maniago (Maniago Knife Makers)