Knex M4 S-system.

Here is my knex m4 s-system. it looks alot like the real thing. the bullet ALWAYS leaves the barrel because of the line of orange connectors under the top rail (i give credit to ironman, nutty guy and katarukito)

features...

15 round non-jamming mag
4 different types of rails
true trigger
foldable front sight
powerful
foregrip
comfy handle and stock
trigger guard