I'm comparatively new to the forum, and M14 platform, and this is the first time I've heard of this fiasco. What a shame.
Here in NYerstan, the any other's have been illegal. With the UnSafe Act, AR pistols were banned, and your basic modern AR has to be completely neutered.
No matter the 4473 form, and or the log book, either way, according to the local FFLs, they come in for the audit and make copies.
One FFL had a white paper on "any other" ARs, to say they were legal, and did a sales job on hundreds over 2 years. ATF finally caught up with him.
A buddy of mine had shown me the white paper and the other AR being legal. I told him, don't buy, stay away, it's trouble for NYerstan.
He said, too late.. I said good luck.
6 months later, he received legal paperwork in the mail from the local PD to surrender the weapon.
He asked me what to do, told him, just surrender it.
He made the appointment, went down to our PP1 HQ, interviewed, they took it, and told him he will get it back once the trial is done. And it'll be returned to an FFL that can make it legal (for NYerstan). I have to follow up with him to what happened.