Knex Slide Loading Rifle

here is a new knex mechanis
i was trying to build a rifle with that kind of mechanism
and finaly i've build one
this gun is very innovate but not very powerfull
it's only a prototype so everone can mod it to a powerfull knex gun
i'm not going to post an instructable for it but i will let you see how it works
i hope you can all build it from the pics
if you want a bigger pic just click on the picture and change the size of it