If it was a recent purchase they are mistaken. Changes last year to the form 4473 have a separate listing as a "receiver" which under ATF rules is neither a pistol nor a revolver until you build it as such. If you bought stripped receivers the FFL you purchased them through must have selected "receiver" on the 4473 since they didn't transfer a rifle or a pistol to you.
You can therefore build it either way so long as you don't build an illegal configuration as an NFA classed firearm (ie... SBR or AOW) without the appropriate approved Form 1 from the ATF.
I'm sure someone will come along with a link to the ATF doc on this shortly.
To have a right to do a thing is not at all the same as to be right in doing it. - GK Chesterton
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