They're talking about the bolt-action .50 BMG uppers people are trying to import, mainly because 1.) a bolt-action receiver counts as the part the barrel's screwed into and 2.) the standard AR-15 setup requires the upper being connected to the lower to fire without violently disassembling itself into the face of the shooter.
Blame this on bumpstock-tier dumbassery, not the ATF.
ATF thread
Michael Allen
Carter Morales
Fuck off cuck.
Wyatt Bailey
It's whatever the ATF says it is.
Oliver Brown
Is this a gun?
Jaxson Hall
Not yet….
Easton Morris
Yes
Brody Evans
No one is really sure, Poland. It varies from day to day and month to month. Even the atf don't really know, sometimes these definitions just pop in and out of existence with little to no rhyme or reason.
Elijah Ross
nigger they made a bolt action rifle that doesn't specifically need an AR lower to function
Juan Baker
And a standard upper can fire without a lower as long as you have a pin punch and a hammer, not to mention these exact goddamn uppers have been in existence for decades you stupid motherfucker. Stop kissing the ass of the enemy.
Xavier Myers
You think the agency that declared a shoestring a machine gun, putting an arm brace on your shoulder "manufacturing" an SBR, thought it would be fine if they called M855 armor piercing *after* it became one of the most popular 5.56 rounds, ignores anti-gunners making SBRs on online videos, gave guns to cartels, and considers handguns with a forward vertical (not angled, potato, bipods, etc.) grip to be AOWs, will adhere to logic?