| Actor | Character | Firearm | Notes |
|---|---|---|---|
| Helen McCrory | Aunt Polly | Webley .455 Mk IV | - |
| Ian Peck | Curly | Lewis Gun | - |
| Joe Cole | John Shelby | Lee-Enfield Mk.I | - |
| Sam Neill | Inspector Chester Campbell | Lewis machine gun | with stock and bipod removed |
| Samuel Edward-Cook | Danny Whizz-Bang | Lewis Gun | - |
| Samuel Edward-Cook | Danny Whizz-Bang | Luger P08 | - |
| Tom Vaughan-Lawlor | Byrne | FN Model 1910 | (S01E05) |