Right on, those are a good looking brace as well. If you're going to order from HBI, you can't go wrong with the trigger spring kit, trigger, and charging handle all of which I have and love. The other thing I think makes the biggest difference is a grip. The angle of the factory one is awkward...
The safety selector is a must so it doesn't dig into your finger. I went with a long AK style on the right, and delete on the left, both from HB Industries. Easily the best mod though is the tailhook adapter and brace so that it's still a "pistol" but with functionality of a SBR.
I stumbled across the following youtube video and noticed the following:
https://www.youtube.com/watch?v=4-OTQ3yunfU
I noticed the clay car in the background and started wondering if it may be "deployable" or "active" for adjustments to downforce or an airbrake.
Thoughts?