Okay so this is a much simpler instructable than others you may have seen, and best of all ITS FREE! This contraption is made using the simplest of household items. This device was inspired by the wrist mounted gun from Assassin's Creed II. You need to use a bit of finesse when making this, as the tools you will be using most will be your hands. This is very much a project in which you might make a few mistakes and may have to redo things, your mount might be made differently and different materials will be used depending on what is available. But have faith fellow builders, I promise you it will work out in the end!
Step 1: Step 1: Materials
Multi-tool (preferably with a cutting blade and serrated saw blade)
1 Rubber band
2 mechanical pencils (with eraser)
1 wire coat hanger
1 Long black sock
1 backpack strap
Step 2: Step 2: the Gun
To create the main firing mechanism you will need to disassemble the two pencils. If you need to you can cut the rubber grip down the middle, save this as you can use it later. The sliding inside portion of one (with the eraser still attached) will be the ramming portion of the assembly. If need be you can use the multi-tool to cut off part of the pencil body. You will need to cut the rubber band and attach the two ends to the front end, or firing end, of the pencil with the scotch tape. Cut a slit down the middle of the eraser and thread the loop end of the rubber band through it.
Keep in mind you should frequently test the device as you proceed through the steps. Load in a BB and test fire it. Depending on how long the sliding part is, you should gain some considerable force to fire with.
Step 3: Step 3: Gauntlet Assembly
To make the gauntlet you will need to first make the frame. Unwind and straighten the coat hanger and bend it into a U-bend. Then lay it flat and bend it upwards around your wrist, then band it back into a simlilar shape as the bottom U-bend. You should now have something similar to the picture below. Tie the whole frame secure with string where needed. Tape the firing assembly to the bottom of the gauntlet. Loop and attach the backpack strap to the back end of the gauntlet.
To make the cover, take a long black sock and cut small holes at the end for fingers, this will make a fingerless glove at the end. Cut a hole under your wrist so that the gun assembly has an opening to fire from, then cut a hole by where the pull-back part of the firing assembly. To finish it just tie a string to the eraser end of the assembly and then tie the other end of the string to the pencil grip, to use as a pulling handle.
Step 4: Step 4: Firing
Now that the whole thing is finished it's time to test it.
To use it, put on the gauntlet and pull the backpack strap nice and tight. Pull over the sock cover and thread the pull-string throught the opening next to the back end of the firing assembly.
Now strike a cool assassin pose, load the BB, pull back the string and RELEASE! Watch the BB strike its target and enjoy!
If you have any upgrades or variations on this device feel free to message me!