This is my first nerf stringer model, its a single shot pistol that takes half-dart shells. The only hard-ware required is just some 4-6mm diameter bungee cord and a rubber band.

Assembly pretty self explanatory, the pins may be a little tough to put in, i would recommend gently knocking them in with a hammer.

Update: 

There was an issue with the slide not being able to slide onto the body due to size issues. im sorry about this problem and i have appropriately updated the model, please notify me of any persisting issues.