I was recently at my LGS picking up some magazines and such. I was waiting for the guy to get off of the phone standing around by the counter. There was a guy ooglin' some AR platform and talking to the guy behind the counter about accessories. I heard the employee say something like "It's a pistol so you cant get forward grips for it." When I looked at it, everything seemed like a regular AR platform. I believe I even heard it was chambered in .223. So what am I not aware of here? Call me naïve or whatever, but what constitutes a pistol?