I'm trying to build a semi-automatic and was thinking that maybe i could duplicate a bigger(more shots) version of the blastfire mechanism, but first i need to understand the theory behind it, so i was wondering if anybody else did, or could dismantle an old one and figure it out. i mean, theres plenty of pictures of the mechanism and all, but i don't get how if the whole tube with the holes to the barrels is pressurized, only the last barrel fires, or at least why the empty ring in the notched piston, right infront of the seal, causes that. now i'm rambling, but if anyone could help, it'd be great. thanks.
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