The parts that I will install on my Scorpion are: The HBI pistol length hand guard, Magpul Zhukov folding handle and HK 3-lug adapter. I have already gone through the trigger and other items, and let's just say, I am a big fan of HB Industries, though have sourced other items from Shooter's Elements, Yeti, and CZ Custom; working toward 922r compliance.
As soon as I get my Form 1 approval, e-filed 16 June 2016, I will begin the install/conversion.
I have a Silencerco Octane 45HD can in jail until the Form 4 approval is obtained, filed 3 July 2016.
Just waiting for the other shoe to drop at the BATFE..... I am guesstimating to see the Form 1 stamp in Jan/Feb 2017, with the Form 4 stamp in April/May 2017. If it is sooner, that would be great, but who knows....?
Good luck to everyone.