Talonair

So, my university's Humans vs Zombies society has decided that the theme for the next game will be Lovecraftian, 1920s era. To that end, people have been gathering costumes etc for the game. I already own a Hammershot for the revolver, but I am stumped on how to make my Rayven look like something from the 1920s. I don't want it to look like a specific weapon, just like the style of the era. I do own a drum magazine which may help.

Few requirements: Since I live in the UK, it must apply to the laws surrounding imitation and realistic imitation firearms (You would think that being a Nerf gun alone would meet this, however we've had the police called on us more than once because people have thought they are real weapons). To that end, a fair amount of the blaster must remain its original colour