Instructables
A while back I found instructions for a clever office supply bow and arrow and was inspired. I decided to step things up a notch. In the end I had a nifty little "crossbow" that straps to the inner arm, perfectly concealed by a loose sleeve. With just a flick of the wrist, your classmates won't know what hit them!

This is the second incarnation of the design. The first was held together entirely with gorilla tape and I only had enough pictures for a slide show.

**Careful!**
Though not as powerful as other designs, this thing can still do some damage. Do not point it toward the face, it could easily take out an eye. Do not aim anywhere that can potentially damage something, it's awkward aiming with the forearm, so its accuracy can be hit or miss (pun intended).

 
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Step 1: You Will Need...

Picture of You Will Need...
Materials:

At least three Bic ballpoint pens
A thin rubber band*
A clothespin*
Several craft (Popsicle) sticks
A length of strong thread*
Duct tape (No project is complete without it!)
A ring (optional)

*take care selecting these items. Too strong a rubber band can't be held back by the clothespin. Too strong a clothespin will break your thread. If everything is too strong you risk yanking the whole thing off your arm when you go to fire.


Tools:
I was able to rig one of these with mostly scissors and a roll of gorilla tape in the back of class, so don't sweat the details. However, I have found these to work quite well:

Scissors
A hot glue gun
A small-bit drill
A fine-tooth saw
Duct Tape (So important it deserves to be named twice.)

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EJFSmart16 hours ago
It is awsome
works awesome
temp_1426694754.jpg
EnderMine6347 months ago
Amazing just amazing totally going to make
raclaw748 months ago
is there any other substitute for the pens?
Subdood9 months ago
Dude. That is so awesome I'm gunna DIE! I will totally make this!
ajjay11 months ago
How far does it shoot
BTW, i have possible ideas for one that fires multiple instead of just one.
Thanks man! i have been looking throughout this whole site and yous is by FAR... THE BEST ONE! And it works good. When i brought it to class some kid tried to copy it, but he somehow shot himself in the face! (so i shot him afterwards)
rlinnihan1 year ago
I found that a scew driver and a drill work best instead of an exacto knife. (More kid friendly) ;D
Is their any other device I could substitute the clothespin with
lbramwell1 year ago
Something I'm looking forward to getting sent to the principal's office for c;
I realised why it needs sturdy string,i keep flicking my wrist hardly and the string just breaks
Blorph1 year ago
I want to find an Instructable that is a K'nex version of this crossbow.
Kyw Yw Yw1 year ago
I don't understand how to tie the string to the clothespin and connect it to the ring...
DucttapeNinja (author)  Kyw Yw Yw1 year ago
Drill a hole through both both tabs on the end you pinch together. Tie the string through the hole on the outside tab, then run the loose end through the hole in the inside tab and underneath the whole crossbow.
memorris0272 years ago
HAHAHAHAHAHA!!!
makuze4 years ago
thanks!!! it works perfectly its very comfortable! and at the first shot i accidently  shot my finger and it hurt alot but evrybody was afraid of me with that thing :D

It's the same for me with a blowgun I made.
DucttapeNinja (author)  makuze4 years ago
Outstanding! Spread the fear! >:D
And hey, now you know it works really well.
lromo13 years ago
fake hand
jmirus lromo13 years ago
Well, of course it's fake, lol. You try taking a picture of your own hand while holding your arm flat down on the table xDDD
jmirus jmirus3 years ago
With a crossbow strapped to it lol
DucttapeNinja (author)  jmirus3 years ago
Actually that's my hand. It's directly under the light which is flattening out the features or something. Though it was a little tricky getting this shot.
i just got finished making something similar to this. it's like one of those spring loaded spears, but it is a down sized version that you hold exactly like this. it only took 3 k'nex, a rubber band, and some gorilla tape. I'm actually surprised at how well it works when i use it right. i do plan on making the crossbow shown as well too.
qwerty4033 years ago
i took the seemingly obsolete remainder of the pen from step 3 and put it in the roll.
DucttapeNinja (author)  qwerty4033 years ago
Ooohh... that was smart.
qwerty4033 years ago
as i said before, i didnt cut another pen; i used previously cut ones.
d3mond00d3 years ago
Err... I made mine and it shot the ink cartridge a foot or less, and it just dove down... Any solutions to make it shoot further and stronger?
DucttapeNinja (author)  d3mond00d3 years ago
I'd just tighten the rubber band. I usually loop mine around the nose piece.
can you use cardboard?
Yes, I think, but this wouldn't be so resistent
nice work, looks sweet. for the 3.0 version, u should make it so u cant see the crossbow at all

How do you mean? It's already pretty much completely concealable under a long sleeve. I'm always up for refining the design, but I'm not sure how to get it any less visible unless I used 'The One Ring' for the trigger.
I'll use a ring-ized paper clip
i really dont think it could be anymore descreit
Delo973 years ago
Can you use also skewers for ammos?
DucttapeNinja (author)  Delo973 years ago
If it fits I don't see why not. I wouldn't point that at anybody, though.
Thanks! Anyways, I think I would tape the end.
We love duct tape!
We love this proyect!
macboy983 years ago
hey ducttapeninja could u make a hidden blade like this instructable
oh and about how long are the strips of tape you use for the rubberband holder?
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