By Shit_on_Wheels

***ROCKET DERRINGER***

*This is a toy and must be treated is as such. Not suitable for self defense. 
Wear eye protection just in case lol*

For this build you'll need:

-Some 3mm screws, some of them have to have their
heads clipped with pliers or cut with dremel.
-Strand of thick spring wire to make a simple hammer spring (1.4mm or thicker).
-Pen spring.
-Rubber band.
-Caps for toy revolvers or regular caps for blackpowder guns
(for example, Colt Navy 1851). 
-Whistling bottle rockets (OD about 7mm).

There are no assembly instructions, just use picture as a reference.
You'll figure everything out on your own 'cause you're a smart fella.