I Just picked up a Draco over the weekend to turn into an SBR. I am going to run some rounds through it over the next week to make sure it shoots and is reliable before sending in my paper work. For the interim, I plan on pinning a longer flash hider on the barrel to make it greater than 16" until my paper work comes back. This way.. I can at least enjoy it for a few months with the stock on it and still have it legal.