Yes. paper could be crafted into a shape of a gun but it might need other materials such as ...
paper cement - hold in place
paper clip - to hit the BB
elastic bands - to crate the kinetic energy
how I would make it is by rolling paper into a tube just large enough for a BB to go through X2.
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then making a hole for on to reload /put BB in the chamber.
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than glue together
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then take a bunch of paperclips and make then into a long line of metal with a huck and a flat end
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then pot paper clip thing into the tube
then by holding ruberbands and tube you can fire it
it all depends on the make and model. You did not say what kind of BB gun.
Yes I can
Pretty much outside the scope of a hobbyist
You need to Identify the make and model of the BB gun in order to get an answer not the serial number
Any gun can just as easily hurt its owner as anyone else. There are many companies who make BB guns that will last for years
If its a BB Gun, Then Yes.
make it with paper silly people\
A BB gun is an Air Gun. Now if you are asking is a BB gun better than an "Air Soft" gun that is different. As for better, well it all depends on what you want it for. A BB gun will do more damage than an Air Soft gun. But that doesn't make it better. basically an air gun has hollow pellets to a bb gun a bb gun has metal balls so they are basically the same gun but with different types of bullets
Follow the maker's instructions on cleaning and lubricating your BB gun, and you will get the most that it was designed to do. If you start changing things in your BB gun, it will put more stress on parts than they were designed to take, and you will break it.
It is not possible.
Windmills
Cost prohibitive