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Originally Posted by Ghost Snake
As far as I understand, those barrels DO NOT impart spin on the bb. The purpose of the grooves is to allow air to travel in them, past the bb, creating a cushion of air around the bb. The bb then rides this cushion of air, perfectly in the middle of the barrel, never touching the the actual barrel. I believe it was Illusion that said this. So that barrel is not for what you think it does.
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Meh, in that case it's pretty unimpressive.
And regular barrels (especially tightbores) already do this, by way of Bernoulli's principal (specifically the Venturi Effect). Simply put, if everything is working properly, your BB should never be touching the inner barrel on its journey towards the muzzle. Hrm, actually it's doing the opposite, since the Venturi effect creates a relative low pressure system around the BB (the air has to speed up to get around the constriction; think airplane wing)