You could use an HPA tank regulated down to lower pressure. It would be able to fit in the tube of a retractable stock or even in a fore grip. They come pretty small. You could also fill it with CO2 instead of HPA.
JD Airman sells these in various sizes.
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Originally Posted by CDN_Stalker
Use 0.36g BBs, you'll not only hear the hit, you'll also see a BIG reaction from the guys you shoot, like "WTF just hit me, a rock?!?"
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