You will need to have a non adjustable brace, that is on a pistol buffer tube, with a short LOP, no hand stop/hand grip, and an optic with no eye relief constraints.
From what I heard on mrgunsandgear last night, at least on fin style braces, if the piece of velcro cloth is missing, that's 2 points. Also on split braces, if they are "too small" to fit your arm in, that's a hit. I forget how many points, but a split brace that doesn't fit me might fit someone smaller. Enforcement will be arbitrary.
It's almost like they consulted with Kafka when they made the worksheet.
Anyway, I'm guessing the TF1913 I use on the Canebrake would get me in trouble if the Canebrake doesn't fall into the Snake River.