Any
- non-adjustable blade (e.g. the original KAK) fitted with a strap (included by the OEM or as a user mod, since the proposed rule review process applies to the individual firearm as submitted to the BATFE),
- SB tactical friction-fit brace (e.g. SBM4, SB Mini), and
- non-telescoping tailhook-style brace is going to be three points or fewer under Section II, as it's written.
The newer adjustable braces that are basically stocks (rigid with tons of surface area and use the same carbine or PDW buffer tubes used on rifles, e.g. the SBA3, the SBPDW)... you can definitely see that those are the targets of the proposed rule.
The proposed rules are rewinding the clock to 2015-2016 for AR pistols. Pretty much any 7.5-10.5" AR pistol that has a SB15/SBM4/SB Mini/strapped Blade/original Tailhook brace conforms to the proposed point system so long as the pistol has a red dot on top. Same goes for Scorpions, AKs, and MP5 clones. So, if the rule goes through, a whole bunch of pistols won't need to be altered at all. Some will be, but it will be cheaper than the cost of a stamp to make those mods. A pistol buffer tube and pretty much any of the cheaper braces on the market will satisfy the points system. I can't really think of an AR pistol that would be banned or "California-neutered-into-uselessness" by the point system. They just won't have the highly-adjustable "not-a-stock" braces.
I DO NOT SUPPORT TO NFA OR THINK IT SHOULD BE LAW. That said, it is, until SCOTUS overturns it or Congress repeals it. As someone that's worked with manufacturers and distributors in the industry, they'll probably appreciate the certainty of the points system as opposed to investing risky capital in "grey areas" of the NFA.