Yet another barrel by Poseidon, has emerged, this one has a channel in the bottom of the barrel, designed to control the bb on flight.
There is also a piece on "you tube" saying how this has been done before and is a rip off, from some other guy.
I have actually tried this barrel out in a DMR running at 450 fps, and so far doesn't do any better than the madbull barrel that came out of the test gun, a few more adjustments to make, and a few more ideas to do, before we chuck it back in the packaging in disgust!
Normal barrels only shoot 40m?!
It looks like 1/3 of those Prometheus delta strike barrels (which were also shit).
I think the main issue with them is the amount of air an AEG can put out to maximize the 'stabilizing cushions' these things have; short of running a large cylinder with a short barrel, or using them on a GBB or HPA system where you can 'cheat' with the air volume.