I just want to start off by saying that I didn't design this gun, I'm building it off instructions I found on NightHawkInLight's Instructable.
And also, I had no idea how many people have already made variations of this gun, so I apologize that I'm not bringing anything new to the table. However, I had fun building it and have since looked into ways to modify it and so I thought I'd share my FULLY AUTOMATIC WIGGLE GUN with you (it's a WIGGLE GUN because you have to wiggle the barrel around so it'll keep shooting BBs. It's actually a design flaw on my part :)
SAFETY CAUTION: this becomes a fairly powerful BB gun so it goes without saying - DO NOT SHOOT IT AT ANYTHING LIVING, ANYTHING VALUABLE OR ANYTHING EXPENSIVE. Wear safety gear and goggles when using it. I am not responsible for any irresponsible use of this device. Use common sense and be safe!
Here is a video of the gun in action:
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Step 1: Materials
There aren't too many materials here. I used a 20 gal air compressor and otherwise the build consists of:
-7mm brake line tube
-hot glue gun
Step 2: Assemble the Gun
Drill a hole in the side of the bottle and feed the airgun through. Screw the cap on inside the bottle.
Drill a hole through the cap and feed the brake line through. Hot glue it in place.
Fill the bottle with BBs, screw on the cap and laugh maniacally, yelling "say hallo to my leetle friend".
It's that easy!!!
Step 3: And Now You Can Use It!
We got a little too excited and started devastating pumpkins in the shop (it makes a huge mess and leaves BBs all over the floor!). But it's pretty crazy how strong it is. Please make sure to wear goggles and try to be safe if you're going to make one of these!!!
And that's it! I would love to hear in the comments section about any mods or improvements you might have. Or send a link to one that you've built!
OK, be safe!