This is a Very simple Web shooter/Wrist shooter.

Assembly guide 

Other things needed:

.8mmx0.8mmx45mm spring for bullet

.8mmx2.7mm magnet for bullet

.Two 5mmx3mm magnets for cartridge and base

.small elastic band to keep the release lever closed

.A bunch of paperclips these will need to be cut and put through the connection between the release lever and main body/wrist mount and are used for the wrist band if needed or a thin watch band can be used

I may make a better functioning version in the future:)