I have been wanting to purchase a CZ Scorpion Evo for some time. I do not own one at the moment. When the 2016 models roll around, I intend to purchase a pistol version and Form 1 it into an SBR with the US made CZ stock and 922(r) compliant parts. That is unless they start to sell the SBR outright. CZ's 922(r) compliant kit that contains the US stock and parts has been hard to get, as it is always "out of stock". This leads me to my question... Keeping in mind that I don't have the firearm. Once I do purchase one, would it be legal for me to possess the parts that will ultimately make the pistol an SBR before the Form 1 comes back? I just want to do everything legal and by the book. Also, how does "engraving" play into the Form 1 for this particular firearm?