After I removed my entire brace, I replaced it with a new padded pistol tubes, this helped with the cheek rest.
But then I noticed having lost the added expandability of the brace, I also lost too much line of sight radius, this in combination with a short barrel. This meant my new viewing angle was now straining my eyes and neck. Even with a red dot, my face had to plastered hard against the cheek rest.
So I did some research and replaced my short barrel with 11.5" and boy, what a difference a few inches make. I now had the room to mount both Irons and red dot at farther down my line of sight. Now I can cheek the Pistol comfortably and effectively place groups, even at 100 yards.
OK, now here is the kicker. Even though I have removed and destroyed the pistol brace, I now have complete loose 7.5" upper with no pistol lower attaced! Am I now in NFA violation of possessing an unregister potential SBR by proximity to AR rifles? So do I now have to buy another pistol lower to attach to that loose upper to close this potential NFA proximity violation? Or is having complete AR pistols and AR rifles at the same safe, room, or domicile a potential NFA proximity violation? This is wher the whole brace rule has opened the whole can of potential NFA violations. And while you may say that its rare it would happen, its actually happend and happening, just not on a large scale, YET. So at the very least you may want to consider separate lockers or separate locations.
I have a lower i SBR’ed in 2013. Personally i havent chnaged anything as i can put all my uppers on it.
I realize I’m being over nurdy and borderline facetious, but when you think about it logically, a brace compared to almost all othe major components on an AR pistol, is about as dangerous as wearing a pair of corrective lenses because seeing better makes you more dangerous. But this fight is not about public safety but about power over their constituents.
If it were me, I’d either:
1.) rebarrel the upper and “lose” that original 7.5-inch barrel, or…
2.) talk to a smith about having a barrel extender and a muzzle device P&W’ed to the end to bring it into compliance. That would essentially make that original barrel worthless, but it’s not like you planned to sell it, anyway, right?
The ATF has said a shoestring was a MG, a stock added to a glock 19 makes a short barrel rifle, and a brace on an ar15 makes a pistol. There is no winning because they don’t make logical decisions. Their only goal is to crush the little guy.
Swapped to a 16" upper.
Possession of a sub-16" is not a crime. Tomorrow morning, it may be. Who can say?
It bastardized my PSA 300blk and my JAKL
They’re sad 
As our forefathers said: " If we are not willing to stay the course and hang together, we will surely hang separately anyway"