If the frame in both instances was the same, what’s the problem?
Again, the ATF determination was on the frame only, not the complete kit. Thats a huge problem. Part of the process to determine if the item being submitted for determination is an "80%" is the time and difficulty to complete into a functional firearm. BTW "80%"........is not mentioned in federal law or ATF regulations. There is no fine line, it is purely ATF FATD technicians determining that the item is/is not a firearm.
It’s not like they say materials must be sourced from different locations or vendors. Seems more like they are wanting to change interpretation and make what they once approved verboten, they have been known to do that too.
Try reading the determination letter and you'll get a feel for the narrowness of the determination.
The word “readily” does not really have a time constraint of minutes, rather without much difficulty : easily. A multi axis CNC machine tooling and offsets already setup a receiver can be machined from billet or forging with the push of a button in a matter of minutes. If they took hours to complete Palmetto couldn’t sell them for <$30 and still make a profit.
Well, "readily" is/has been determined by the courts in cases involving NFA firearms:
Eight hours in a well equipped machine shop in US vs Smith
https://scholar.google.com/scholar_case?case=7816160032134580662&hl=en&as_sdt=6&as_vis=1&oi=scholarr
Two minutes in US vs Woodlan
https://law.justia.com/cases/federal/appellate-courts/F2/527/608/309723/
There are other NFA court cases that refer to "readily" in regards to making a dewat/demilled firearm into a new firearm.
With NFA firearms, courts have identified several elements of restoration:
(1) time, how long it takes to restore the weapon
(2) ease, how difficult it is to restore the weapon
(3) expertise, what knowledge and skills are required to restore the weapon
(4) necessary equipment, what tools are required to restore the weapon
(5) availability, where additional parts are required, how easily they can be obtained
(6) expense, how much it costs to restore the weapon
(7) scope, the extent to which the weapon has been changed
(8) feasibility, whether the restoration would damage or destroy the weapon or cause it to malfunction
It's not that far of a leap from a deactivated/demilled NFA firearm being restored vs an "80%".