Does Bob's 80Percenters.com possess jigs, tools, or instructions anywhere within their inventory?
No.
If Bob's has even one jig on a shelf somewhere in their warehouse, then every 80 percent lower they possess is by default also a firearm, even before it is sold to anyone, because they possess both the 80 percent lower and the means to complete it.
Not necessarily.
As an FFL, I can possess a pistol in my inventory as well as a shoulder stock for that exact pistol.....and it not be registered as an NFA Short Barreled Rifle. While I possess both at the same time, its clear that both are separate items in my inventory. Similarly, a dealer may possess an AR rifle and a barreled upper with less than a 16"bbl and not be considered as constructive possession of an NFA firearm. It would likely be much different if the person possessing was a nonlicensee.
If Bob's 80Percenters.com then sells one of those lowers to Joe Sixpack, are they not transferring a firearm?
You make the assumption that Bob's 80Percenters.com is also stocking jigs. That may be a faulty assumption.
It was a firearm when they possessed it. Or can the 80 percent lower magically not become a firearm when ownership passes from one entity to the next?
Again, as has been repeatedly stated by many in this thread, as well as by ATF, an "80%" lower or frame IS NOT a firearm unless sold or possessed with a jig, tools, etc AKA as a "kit". If Bob's 80Percenters.com sells an unserialized 80% lower/frame.......theres a big hint whether its a firearm or not.
I think an 80 percent lower will be treated by the ATF as "once a firearm, always a firearm,"
Yet ATF clearly disagrees. I'm not sure where the disconnect is, but c'mon man......read the freaking rule, specifically pages 10-15. AGAIN, for the illionth time, an " 80%" lower or frame BY ITSELF is not a firearm. From pg 11:
Example 1— Frame or receiver: A frame or receiver parts kit containing a partially complete or disassembled billet or blank of a frame or receiver that is sold, distributed, or possessed with a compatible jig or template is a frame or receiver, as a person with online instructions and common hand tools may readily complete or assemble the frame or receiver parts to function as a frame or receiver.
in the same way that you can convert a virgin receiver into a pistol, and then the pistol into a rifle, then back to a pistol again, but you can never create a pistol from a frame that was originally part of a rifle. "once a rifle, always a rifle."
Well no. And here's why there is a difference:
1. 80% lowers or frames ARE NOT FIREARMS unless "sold, distributed, or possessed with a compatible jig or template is a frame or receiver, as a person with online instructions and common hand tools may readily complete or assemble the frame or receiver parts to function as a frame or receiver." AGAIN, NOT A firearm.
2. Your example of a "virgin receiver" means its ALREADY A FIREARM.
3. Your "once a rifle, always a rifle" is incorrect. Its been incorrect for over a decade. It's perfectly legal to reconfigure a pistol into a rifle by adding a 16" barrel and shoulder stock AND subsequently reconfiguring that rifle as a pistol by reassembling as a pistol as defined in federal law. ATF issued Ruling 2011-4 in 2011 and its been discussed to death on this and every other gun forum since then.
https://www.atf.gov/firearms/docs/r...red-rifles-rifles-configured-pistols/download