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I got curious a long time ago and asked some folks that may have better ideas than me about why certain parts of certain guns are regulated but not the equivalent parts on other guns.
For example, the AR15 lower is the "gun". But the FN-FAL that also has a lower and upper split receiver, the upper is the "gun".
A few choices - the part that the magazine attaches to was mentioned. Well, great. Except that blows out the Ruger Mk * series of pistols, where the upper half (barrel and such) is the gun, and the grip (w/ trigger, etc. and where the magazine is latched in) is unregulated.
The better thought I had was "the parts that let things go full auto". The lower on the M16, and the sear-cut in the upper (as well as ejector block) on the FAL.
What makes it fun for FFLs with the FAL that don't know the FAL is quite often both the upper and lower will have serials, and unless it is a pre-89 ban import OR someone paid for a forced-match-numbered after market receiver for a build, the numbers will never be the same.
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