The end plate is a piece of 1/4" thick plexiglass. The spring is a spiral-bound notebook spring. The piston beneath was made from an old screw, a few nuts and a plastic washer. I made the machine gun body from a 1" wide by 1.5" high by 2.5" long plexiglass block (actually, I cemented two 1/2" plastic sheets together to get the 1" wide block.) Inside the block you can see the 1/2" dia brass cylinder tube and the longer 1/8" brass air tube above it, which can be purchased from any hobby store.
Automatic bb guns full#
(You can click on the picture to view it in full 1024 x 768 resolution.) I drilled out the threaded end of the CO 2 cartridge for the BB reservoir. To the right you can see the disassembled parts of the gun. The animated image is in slow motion the BB gun actually fires about 5 BB's per second. The air in the cylinder depressurizes, and the spring returns the piston back to its forward position to repeat the cycle. As the piston continues backward, the air blast is then directed fully behind the BB and out the barrel. The pressure also travels up and through a gas tube to the space between the bottom two BB's, blowing the bottom BB downward from between the magnets into the barrel. When the fire extinguisher "trigger" is depressed, air enters the piston and cylinder assembly and blows the piston rearward. In the animated image, the reciprocating piston automatically feeds individual BB's from the reservoir into the barrel. BB's from the CO 2 cartridge reservoir are prevented from dropping into the barrel by a pair of small magnets (shown by an "M" in the picture) and by the small end of the piston beneath. The image to the left shows a cut-away section of the gun. (Hold cursor over this text to view automatic operation.) I did test the gun once (very carefully) at 200 psi it would actually shoot a BB through a steel garbage can. The fire extinguishers and gauges could be safely pressurized to 100 psi, which provided enough air to operate for about 5 seconds. They used an old BB gun barrel, some scrap metal and plastic pieces for the feed mechanism, a used CO 2 cartridge for the BB reservoir and a small fire extinguisher as the compressed air cylinder, stock, handgrip and trigger.īoth automatic feed mechanisms seemed to operate best between 50 and 100 psi. I made two of these actually, one while I was in high school and the second a few years later.
Automatic BB Gun - Fully Automatic BB Gun.
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