Model 3 Revolver

The Model 3 Revolver was a firearm obtained by Jacob and Evie Frye during the nineteenth century. Fairly basic in design, this powerful firearm could easily be concealed, allowing it to be carried through the streets of London. The Frye twins received this weapon as a gift from Sergeant Frederick Abberline of the Metropolitan Police Service after they had helped him lock up nearly all of the Blighters on his list.

Reference

 * Assassin's Creed: Syndicate