Most BBMGs aren't portable but I used a fire extinguisher I had lying around, I modified it to be refillable via bike pump. Now it's pretty light and comfortable. The cloud chamber is just an old nutmeg container and the barrel is a bic round stic pen. The chamber can hold around 250 rounds of 6mm BBs. I can get about 4 seconds of constant flow from the fire extinguisher and that's enough air to empty about 100-130 bbs, all around 240-260 fps with 90 psi.

Here's how many bbs it can hold.

I added a little grip just for comfort.
It holds like a P90, this all I really need in a match, it's pretty fast shooting little gun, semi-powerful.
Here's one from an older model of the gun that shot 6mm beads.

Here's a newer movie, don't be fooled by the weaknees of the looks of this vid.

It was shot from 15ft. (measured) back, here's how many BBs went into it.
