According to the new 4473 Forms (which go into effect no later than November 15th,
2008), receiver sales fall under the Type of Firearm "Other Firearm" which
includes "receivers, frames, etc".
Section B.
Question 18. Type of Firearms
'... Since a frame or receiver for a firearm, to include one that can only be made into
a long gun, is a "firearm other than a shotgun or rifle," it cannot be transferred to
anyone under the age of 21.'
Interestingly enough, the verbiage on "Other Firearm" includes "...firearms having a
pistol grip that expel a shotgun shell..." which would seem to classify converted Saiga
shotguns as "Other Firearms" instead of a "Long Gun", as previously classified.
In fewer words, if you are under 21 and want to buy a receiver from a dealer, after 11-15-08, you are SOL - nationwide.