Full Auto Airsoft Pea-Shooter

Ok, first things first. This was originally created by "Kip-Kay". I found the basic template on his site. I am not trying to rip him off, I enjoy his videos. 

http://www.youtube.com/watch?v=d61-29U9rJ4

That is the video to his design. 

I'm a tinkerer, so, in no offense to Mr. Kay, I wanted to make this fit my needs.  

What I did: 
I attached another pen tube to the top of the canister to allow me to look where I'm shooting, thus allowing me to aim. 
More Detail: 
I took the second pen tube, filled the smaller end with some silicon, feel free to use epoxy I didn't have any on my bench. 
Then, I drilled a small, like 1/8 in, hole in the side of the 2nd pen tube. 
Next I smeared, rather sloppily, silicon where the pen tube would be. 
Finally I zip tied the whole thing together, forcing it to keep solid.  

Tada!