This is exactly where my mind went. The second you take that thing off your AR, you're unlegal. Regardless of whether it has a pistol grip or not, if the bang switch makes it go pop, no judge will ever take your side in court. There's a difference between exploiting a loophole like we do with LAR and Beo mags, but IMHO this is a step past that line UNLESS it is permanently fixed to the rifle. Which is isn't.
Overall, I love it though. I already sucked up for the Spikes launcher because...