Use rat-traps, which you rig with those party pop things. (Two strings, with a charge in the middle, when you pull em, they explode)
You can also rig the "Arm" which hits the rat, with a pouch of some sorts in between. You then restrict the arm to about 45 degrees, with metal flexible wire (or very strong fishing line).
This way, you can fill the pouch with anything you want (powder for example), and rig the trigger of the trap with a fishing line.
I have made about 12, and they throw bb's up to 10 meters! their very cost effective, and work like a charm!
I'll try to find them and post some pics.
You can also rig the "Arm" which hits the rat, with a pouch of some sorts in between. You then restrict the arm to about 45 degrees, with metal flexible wire (or very strong fishing line).
This way, you can fill the pouch with anything you want (powder for example), and rig the trigger of the trap with a fishing line.
I have made about 12, and they throw bb's up to 10 meters! their very cost effective, and work like a charm!
I'll try to find them and post some pics.