They are going to keep trying. Throw enough shat at the wall and eventually some will stick.
Back in the 70's, they started having stores "register" any ammo that could be fired from a handgun! Insane!
Once the T/C "Contender" came out, that pretty much meant "every" cartridge!
Some anti-gun geek announced on TV, "We may not be able to get the guns, but we can get the ammo!"
That lasted about 6 months. When the enormity of the process became apparent, BATF (?) dropped it real quick.
But you are stone cold correct.
It started in 1934 with that GCA.
"We only want to register full auto and shotguns with a barrel length of less that 18"!"
In 1968, it was, "We just want buyers to be at least 18 years old and fill out form 4473!"
THEN...the seller had to call NICS, report WHAT was bought, WHO bought it, WHERE they live.
It just goes on, and on, and on.....!
The "anti's" say, "We want background checks! That's all! That won't hurt anybody!"
Then..."We just want a 5 day waiting period! That shouldn't bother legitimate buyers!"
"We just want an "assault weapons" ban! That shouldn't affect legitimate hunting arms!"
Case head "microstamping" has proven to be a "red herring"!
Much ado about nothing!
You can't give "2A Deniers" an inch!
Not, "No!", but "HELL NO!"!!!
"Molon Labe"