Out of all the fast firing devices out there the GAT actually works and works well.
Unlike the other gadgets that basically "bump fire" a rifle, the GAT uses a crank. Is it a POS?
Well, its made of plastic and uses allen screws to tighten and fasten it on the bottom of the trigger guard. It may leave some marks on your trigger guard.
But once set up correctly, it will make your rifle fire 4 times for every turn of the crank.
Its pretty cool to use once, but after that it loses its appeal. You cant aim and use it because you have to crank it... now maybe a belt fed AR that mounted on a turret and you might have something there.
M.