Silverlance it not "home built firearms" that do not have to comply with 922R its ONLY pistols as 922R only effects rifles so a pistol does not need to meet 922R requirements and can use import parts. As for the fixed box mag I would tripple check the state you plan to go into because most have a stipulation prohibiting the magazine from being seperate of the pistols grip and in front of the trigger gaurd this was to prevent guns like tech nines etc... 922R specifically addresses ANY rifle that is a clone of an otherwise banned for import rifle regardless of who builds it as having to comply with 922R otherwise all of companies catering to the home builder of AK, FALs G3/CETMEs etc... would not exist and all the thousands of home builders would not be trying to figure out how to best meet 922R compliance etc.... thats the problem with "friends" providing information concerning laws that can get you locked up for 10 years...
heres a good link for your friend
http://www.atf.treas.gov/firearms/faq/index.htm
and here is the section specifically dealing with making your own guns
(A6) Does the GCA prohibit anyone from making a handgun, shotgun or rifle? [Back]
With certain exceptions a firearm may be made by a non-licensee provided it is not for sale and the maker is not prohibited from possessing firearms. However,
a person is prohibited from assembling a non-sporting semi-automatic rifle or non-sporting shotgun from imported parts. In addition, the making of an NFA firearm requires a tax payment and approval by ATF. An application to make a machine gun will not be approved unless documentation is submitted showing that the firearm is being made for a Federal or State agency.
[18 U.S.C. 922(o) and (r), 26 U.S.C. 5822, 27 CFR 478.39, 479.62 and 479.105]
more people end up in jail from listening to "friends" than anything else and "my friend said" is not accepted as a deffense in court.........
BTW; Ya do know a hammer MUST always be involved at some point when building any AK based gun right? so that means ya done just right.... now if ya had gotten it together without the use of a hammer then we'd know it was doomed to blow up on ya! LOL