| Actor | Character | Firearm | Notes |
|---|---|---|---|
| Gian Maria Volonté | Pietro "Piero" Cavallero | M1911A1 | - |
| Gian Maria Volonté | Pietro "Piero" Cavallero | Colt Detective Special | - |
| Gian Maria Volonté | Pietro "Piero" Cavallero | MP38 | - |
| Gian Maria Volonté | Pietro "Piero" Cavallero | Sten | - |
| Gian Maria Volonté | Pietro "Piero" Cavallero | M1A1 Thompson | - |
| Tomás Milián | Commissioner Basevi | Colt Detective Special | 1st Gen model with Square Butt grips |
| Tomás Milián | Commissioner Basevi | Beretta Model 38A | With 30-round magazine |
| Tomás Milián | Commissioner Basevi | M1A1 Thompson | With 30-round magazine |