There are people who have gone to court because they had string and rubber bands in their gun locker.
You can do that to make a bump fire rifle. Old trick.
Yet the stock was approved.
Which is why I never had any desire to buy one. It seemed to much like a trap.
Thank you. I myself consider it at product of the 0bama BATFE running a variation of the Fast and Furious strategy.
(Also I'm inclined to believe the police chief of Las Vegas when he flat out stated publicly that whatshisname, the mass murderer whose name I won't repeat, might have had help with what he did.)