Assault rifle you would like to see made with knex?

Hey guys, I'm thinking about making a replica (shooting, obviously) of a modern assault rifle, do any of you have any ideas of what I should make? I want to make something no one has before.

TheDunkis3 years ago
Steyr ACR
Stoner 63

Just to name a few of the ones not done so far. I guess if I had to pick, the Steyr ACR would be my first pick, but it's a funky bullpup design so it'd probably be hard to do.
keltec sub-2000