Picture of cloud BB MG
i just made this cloud BB MG, its fully portable and easy to operate. i got the idea from nightharkinlight you should look at this cos it shows how to build it well. i just modified the design 
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Step 1: The barrel

Picture of the barrel
the barrel is 6 mm, I used a aluminium arrow shaft. the bbs go in the back and the air in the bottem. when the air flows through the bbs bounce around and fire out at a high fire rate.

Step 2: Air tank

Picture of air tank
air tanks just 50mm pvc about 40cm long, i put in a small ball valve and a air compressor quick connect to fill it up to a maxium of 120 psi

Step 3: Trigger

Picture of trigger
the trigger is a blow gun screwed into the air tank and the barrel, i couldn't find a fitting to connect it to the barrel so i used epoxy to glue it into a nipple that i screwed into the barrel.