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The frames or receivers would not be reported, as they are not yet a pistol or rifle. They have no caliber, no barrel, etc.

Fun twist. Since a rifle receiver is not a 'rifle' you cannot purchase one from a dealer if you're under 21. 18 and over can buy a rifle/shotgun, but not a 'receiver'.

There's all kinds of fun you can have w/ ATF rules and regs.

Unless the FFL tells you, or you ask, you won't know. The majority of FFLs are type 1. Type 7s can manufacture firearms. There are other types that don't matter for this conversation. Some FFLs maintain multiple licenses for different aspects of their business.

A multiple is more than 1.

And oddly, for rifles, that rule only applies to type 1 ffls. Type 7s it's 'voluntary'.