Instructables
This is my armless crossbow. It uses a common rail design found on many Instructables on this site. The trigger may or may not be original; it's been so long since I made this that I don't remember. If it is yours, please comment and I'll give you credit.

Step 1: Upper Barrel

Picture of Upper Barrel
100_0116.JPG
Here you will be building the barrel. It can be as long as you like; just remember to add one rubber band to the chain for every four segments of body. I have tested this number and it is the most accurate way to get a good amount of power from this gun. The barrel shown here uses a chain of three rubber bands. Build what you see in the pictures. Build only one.

Step 2: Lower Barrel

Picture of Lower Barrel
100_0114.JPG
This is the lower barrel. This supports the upper barrel as well as being the attachment point for the upper barrel to the handle and for the rubber bands.
1) Build. Also, build its clone, minus the white rods.
2) Attach as shown.

Step 3: Handle

Picture of Handle
100_0111.JPG
Build handle.
1)Side view.
2)Top view.

Step 4: Trigger

Picture of Trigger
This is the trigger.
1)Build.

Step 5: Assembly

Picture of Assembly
100_0120.JPG
100_0121.JPG
1)Barrel. Attach as shown.
2) Trigger. Attach as shown.
3. Handle. Attach as shown.

Step 6: Rubber Bands.

I would have notes, but I can't figure out how to add them. If someone could tell me how, it would greatly help with the clarification of this step. Anyway, you thread the rubber bands through the first slot between the upper and lower barrels from each side, attaching them to the first white rod between the upper and lower barrels. This creates a very strong connection, as well as making it so that the rubber bands won't fly off when you fire. NOTE: picture shows rubber band hooked over a white rod so that it goes over the barrel like that; this was just to store it so it didn't flop around too much when I was taking the pics. NOTE 2: it is MUCH easier to partially disassemble the bottom half of the barrel to add the rubber bands. trust me, i've build several of these things.
 
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CMPassTime27 days ago
If It Doesn't Have Arms, It Is Not A Crossbow, It Is A Shotbow.
is this hard 2 make
(removed by author or community request)
mettaurlover (author)  knex dude 20001 year ago
No, I do not and have not for years.
how far does it shoot?
mettaurlover (author)  builderguy1012 years ago
I haven't had this thing for over three years.
treebie5 years ago
i made it piece by piece bu i cant figure out the firing mechanism with the rubber bands and such 0.o can you make a vid on youtube? please
mettaurlover (author)  treebie5 years ago
no; i do NOT post videos. maybe i'll add notes now that ive figured out how.
swimmer955 years ago
what is the purple piece at the end of the trigger
mettaurlover (author)  swimmer955 years ago
oh, that's the same as a grey one-slot.it came in a box with weirdly colored pieces.
razzlekunai5 years ago
So it's a slingshot.
mettaurlover (author)  razzlekunai5 years ago
yes. it's actually pretty easy to make and uses relatively few pieces for its type