New Knex Concept Gun

This a knex gun that I came up with it uses a vertical firing pin with auto loader (soon be be a fully automatic) this gun can shoot maybe 20ft at least, but it's only a concept so its not perfect. Also before/ or if any one asks I will post internal pics later

Step 1: Coming Soon

Knex Mech v5

Step 2: Ideas

Anyone have ideas for knex things I should build Next?