I have the pleasure of having access to a wide variety of full auto weapons through my company. The primary reason for full auto is suppressive fire.... putting as much led down range to keep the enemy behind cover and allow strategic movement of our own elements. On the other hand we must qualify with various full auto weapons at a variety of targets including rubber dummies, steel and paper. A full auto weapon is definitely something to respect and regard with in the hands of someone who is well versed in its use. I've had guys come out to my range with an array of NFA legal " fast fire" toys. Generally they are wasting ammo and spraying and praying. From trigger devices to triggers to stocks all of them require a bumpfire type of use, in and of itself making for inaccurate fire. With a true full auto weapon the shooter is able to shoulder the weapon correctly hence keeping him on target ( more often). If these devices created a true full auto then they would be required to have a tax stamp. Now on the other hand I have seen guys who train and practice constantly with these upgrades and they are extremely proficient with their weapons, even under stress. So I feel they do have a place in the industry IF the end user is willing to spend the time and money to become proficient with their weapon system. The truth is triburst is the most accurate full auto fire. Furthermore those I know who are proficient work tirelessly on triburst fire.