The website doesn’t state explicitly, but I assume the only modification to the gun is to remove the pistol grip (and install a muzzle brake) to comply with CA law. For those not restricted by onerous gun legislation, the gun can be had with a pistol grip for the same price.
The gun has an appeal that cannot be explained. It’s simply badass. And expensive- $11,800 (with tripod bushing) before the first 100 are sold, then $12,800 after.