I have finished a fully automatic K'nex gun today. It is a prototype and not the best, but it is a good start and i am hoping for it to become an excellent working gun with some modifications. It does have a few flaws in it's design but like i said it is a prototype. My main concern is the fire rate it is so fast the bullets shoot out like a shotgun instead of a true full auto gun. I am sure this can be fixed and i will do my best to get the final version of the gun up as soon as possible. Now to the pros and cons.
Not a terrible amount of pieces
6 round magazine
Shoots like a shotgun
Ok i just finished v.2 and thanks to everyone for their ideas and support. In v.2 i have increased the magazine capacity to 15 from 6, even less pieces now, new handle and magazine design. I also learned if you wish to have more power and add more rubber bands you get the (shotgun) effect instead of the full auto.