Looks like a crossbow, but technically it's a slingshot. I saw instructions for a BIC pen "Bow and Arrow" on the site and decided to step it up a notch.
     This contraption is made to be worn under a loose sleeve, hidden from sight. It shoots the ink cartridge of a ball-point pen. The trigger (a clothespin) is rigged to fire when I flick my wrist back.

**Update**
The instructable is now up! You can find it here.

R-slick says: May 29, 2012. 9:01 AM
how do u make it
DucttapeNinja (author) says: May 29, 2012. 12:29 PM
http://www.instructables.com/id/Hidden-Crossbow-version-20/
yapoyo says: Feb 18, 2012. 8:01 AM
mine doesn't work (despite my picture, i am not a troll)
zingadude123 says: Feb 3, 2012. 7:54 PM
Just a suggestion: you could use a duct tape sleeve instead of a Popsicle stick one so its comfortable.
lpmm215 says: Feb 2, 2012. 11:57 AM
cool very cool if you did a dedlear crossbow would even better but it´s still very cool
NE patsrock says: Aug 3, 2011. 3:26 PM
omg dude this is amazing
JamesHawke says: Apr 26, 2010. 8:06 PM
Hey, cool crossbow, is there anyway to create  a hidden blade mechanism?
dragonchen5 says: Jan 9, 2011. 12:50 PM
yea i created a hidden blade but it takes 10 min if ur a pro and 30 if amuture
ihaveguitarskills! says: Jul 27, 2011. 9:42 PM
PLEASE MAKE AN INSTRUCTABLE OR SOMETHING LIKE THAT!!!PLEASE I WANT TO MAKE THIS REALLY REALLY REALLY REALLY REALLY REALLY REALLY REALLY REALLY BBAAAADDDD!!!!
DucttapeNinja (author) says: Apr 27, 2010. 7:18 PM
A lot of people are using drawer slides. I myself am looking for a good small one.

Here's a good example:
http://www.indymogul.com/backyardfx/episode/BFX_20090119/quick-draw-sleeve-gun-build
JamesHawke says: May 2, 2010. 8:24 AM
I'll see if I can try
Plo Koon says: Apr 25, 2011. 1:52 PM
I like ur username.
ihaveguitarskills! says: Jul 27, 2011. 9:41 PM
the best username ive seen is 'unkown'
Admiral Blaze says: Apr 16, 2010. 8:08 PM
 eh its ok but its only a cross bow ive made an airsoft hidden pistole thats about 250 fps, im making an instructable for and it will be up in about a week
DucttapeNinja (author) says: Apr 17, 2010. 12:37 AM
Ooh, looking forward to seeing that!
Personally, though, I have a certain admiration for the more archaic weapons.
Admiral Blaze says: Apr 19, 2010. 4:26 PM
that thing is pretty cool though i think i might make one, as for the airsoft ive made three differnt models and the first one is only the prototype
ztaffa says: Feb 17, 2010. 6:58 AM
Plz post an instructable i wanna make this so badly
DucttapeNinja (author) says: Feb 17, 2010. 2:53 PM
Here ya go.
ztaffa says: Feb 23, 2010. 1:06 PM
thanks i didnt see that
lycoris3 says: Feb 8, 2010. 4:53 PM
indeed t'is wonderful in mind
Arbitror says: Dec 15, 2009. 6:25 PM
Wow! It's just like Altair's secret blade, only as a projectile!
watzhisface says: Dec 30, 2009. 1:42 AM
like ezios thingy
watzhisface says: Dec 30, 2009. 1:42 AM
can u post an instructable on it
RedneckAsian says: Dec 4, 2009. 1:32 PM
If you replace the ammo with a blade that doesnt launch, rather just stick out when fired, and widened the launcher, it could be like Jigsaw's arm blade in the first Saw. Please post instructions!!!
bowmaster says: Dec 4, 2009. 4:35 PM
I was thinking Assassins Creed.
RedneckAsian says: Dec 16, 2009. 1:49 PM
Yeah that too.
bowmaster says: Dec 17, 2009. 4:26 PM
Assassins Creed is a million times cooler.
watzhisface says: Dec 30, 2009. 1:33 AM
agreed
daggon says: Dec 27, 2009. 4:58 PM
i agree... nice bow, please post an instructable
sergio leo says: Dec 26, 2009. 9:54 AM
wow nice crossbow very creative¡¡¡¡¡¡¡¡¡
sergio leo says: Dec 26, 2009. 9:53 AM
nice crossbow


Koonboi says: Dec 5, 2009. 5:41 PM
How can you post this without instructions?
Arbitror says: Dec 15, 2009. 6:26 PM
Simple, as a slideshow...
DucttapeNinja (author) says: Dec 6, 2009. 1:09 AM
Yeah, sorry. I made this about a year ago, so I don't have pictures. Once finals are over I can start working on one to post.
wangtrevor says: Jan 3, 2010. 3:15 PM
can u post how to trigger mechanism works and just how to build the trigger
DucttapeNinja (author) says: Jan 6, 2010. 2:36 AM
It's pretty much just a clothespin with a hole drilled through the ends you pinch together. Tie a strong string onto one side and thread it through the hole in the other. When the string is pulled, it should bring the two parts together.

The end that is held closed by the spring is what holds the rubber band back, so the strength of the clothespin directly affects the tension you can have in the band. The rubber band is looped through a special catch that fits into the clothespin, so the rubber band is not directly pinched by it.

I hope that helps until I can post the whole thing.
Koonboi says: Jan 6, 2010. 2:21 PM
That helps a lot. Thank you.
zipzapper859 says: Dec 5, 2009. 8:41 AM
nice please post instructable
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