Derringer

Model of a 4-shot derringer for rubber bands. As shown in the photos, the individual parts are assembled, glued, and screwed together

Required materials:

Nails with 1.2mm diameter

Superglue

2 steel shafts / 3mm diameter, adjust length accordingly

6 M3 x 8mm screws / either cut threads with an M3 tap or insert heat-set inserts

1 coil spring 5mm diameter, 30-35mm length

Here is the link to the first model, made with a CNC milling machine