Materials:
1/2 PVC
5 1/2 PVC Elbows
Modded Lanard Shotgun (or any other blaster really)
Rope, String, or Twine
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1. Frame
The Frame is used to Hold the shotgun in place so it doesn't get pulled off the object it is placed on when the rope is pulled.
Take your shotgun


My Rigged Shotgun will be placed on my bed, so alterations may have to be made in the design if it is to be put on other objects. The Front is used to hold the Shotgun down, while the small section in the back is used to hold the frame on the bed. Here are some extra pictures:
This is how it will be placed.

It will be placed on the bed like this.

This is the way it will look once it is dropped in place.

2. The Lever
The Lever consists of a piece of PVC tied to the door with two elbows at the end to keep it in place. This is how it is placed:

Here it is without the trigger pulled:

Here it is pulled:

Finally, here it is put in place:

Tied to the door:

From where it is to where it is tied to the door:

If you didn't understand anything from the writeup, here is a video that may help:
http://www.youtube.com/watch?v=wKrq2eT7x8g