First of all, I'd like to say THIS ISN'T MY GUN, IT WAS MADE BY S0LEKILL3R.
Okay, I'm posting this because I know a lot of you will like it, and it should've been posted a long time ago. It's a great gun, and this idea could be made differently, and more powerful, and this could become a whole nother' type of knex guns. Just think of how this gun could be with a turret, or a longer (barrel?) thing! So ya, I just had to make it and post it.

Okay, now about it. It shoots oodammo, and has an awesome pin, and it's awesomely powerful. It's a great gun, and it's one of my favorite guns ever. Pros and cons.

Pros:
Powerful
shoots oodammo
18 round ammo
cool pin thing
Pretty comfy
Super cool

Cons:
the mag sometimes blows up. (hardly ever)

Get building it! I know you'll like it!