A Co2 airsoft-type BB pellet gun uses the compressed gas from the Co2 cartridge to expel the BB pellet from the barrel. You can make your own Co2 airsoft-type gun from a few hardware parts and a spring action airsoft gun. You will also need a Co2 cartridge and a Co2 valve from a hobby shop. Get adult supervision when making your Co2 airsoft-type gun, as the Co2 cartridge represents a potential threat should it be punctured.
Single pump airsoft gun
You can buy a spring action airsoft gun at a toy store or yard sale.
Do not force the end of the CO2 value onto the CO2 cartridge.
Insert the tip of the flat-edged screwdriver into the gap in the top back end of the spring action airsoft gun. Pull the tip of the flat-edged screwdriver towards the hammer to break off the back end of the airsoft gun.
Screw the end of the Co2 cartridge onto the nipple of the Co2 valve. Continue screwing until the sound of the gas that is escaping stops.
Hold the Co2 cartridge so that the knob on the Co2 valve is pointing up. Push the Co2 cartridge into the back end of the spring action airsoft gun.
Apply bonding glue around the Co2 cartridge where it meets the back end of the spring action airsoft gun. Apply bonding glue to the top of the airsoft gun where it meets the Co2 valve.
Let the bonding glue set for a day.
Cut a rectangle out of the notebook paper with the scissors that is 3 inches long and 2 inches wide.
Roll the rectangle of paper into a tube. Place strips of cellophane tape on the side of the tube to hold it closed.
Put a sheet of newspaper on a table. Place the spring action airsoft gun on the newspaper with the barrel facing to the right.
Insert the paper tube into the front of the barrel. Push the paper tube fully into the barrel.
Wrap a piece of masking tape around the end of the paper tube that is exiting the barrel.
Measure a half inch from the barrel. Cut off the paper tube at the half-inch mark with the scissors.
Place a piece of masking tape on the bottom of the cut paper tube. Put three or four BB pellets into the open end of the cut paper tube. Put a piece of masking tape on the top of the cut paper tube.
Insert one end of the cut paper tube into the front of the barrel.
Go outside into your backyard. Aim your Co2 airsoft gun at a tree or rock. Turn the knob at the top of the Co2 valve to fire the BB pellets out from your Co2-powered airsoft gun.