Quote History Quoted:
Pistol
How is that not a firing pin spring, making a Glock slide the receiver?
The only spring not inside the slide is the trigger spring. That's not a "primary energized component" as it's not even necessary for function.
Rifle
How is this not an AR15 upper receiver?
Also, I find it extremely odd that in all the given rifle examples (10 of them) the AR15 isn't used. It's easily the most popular rifle in the entire country. By design?
View Quote
Keep reading. They explain (among a number of firearms) Glocks and AR-15's. From page 325, 326 and 331:
"(4) The following are nonexclusive examples that illustrate the above definitions:
....
(iii) Glock variant striker-fired semiautomatic pistols: The frame is the lower portion of the pistol, or grip, that provides housing for the sear."
....
"The following is a nonexclusive list of such weapons and the specific part determined by the Director to be the firearm frame or receiver as they existed on that date:
(i) AR-15/M-16 variant firearms: The receiver is the lower part of the weapon that provides housing for the trigger mechanism and hammer (i.e., lower receiver)."
Also in the PDF the ATF states the AR-15 is one of the most popular firearms in this country. From page 5.
"In the past few years, some courts have treated the regulatory definition of “firearm frame or receiver” as inflexible when applied to the lower portion of the AR-15-type rifle, one of the most popular firearms in the United States."