nstassel
NES Member
The below link is a repository of 90 legal opinion letters by the ATF. hosted by the National Firearm Trade and Collectors Association. Some of them are very interesting to us dealing with preban questions and other issues
What is a permanently attached muzzle device? http://www.titleii.com/bardwell/atf_letter40.txt
Extending a preban magazine to make a larger capacity? http://www.titleii.com/bardwell/atf_letter8.txt
Changing the caliber of a preban magazine? http://www.titleii.com/bardwell/atf_letter85.txt
Changing the preban magazine to fit another weapon? http://www.titleii.com/bardwell/atf_letter88.txt
NFATCA
www.nfatca.org
What is a permanently attached muzzle device? http://www.titleii.com/bardwell/atf_letter40.txt
Extending a preban magazine to make a larger capacity? http://www.titleii.com/bardwell/atf_letter8.txt
Changing the caliber of a preban magazine? http://www.titleii.com/bardwell/atf_letter85.txt
Changing the preban magazine to fit another weapon? http://www.titleii.com/bardwell/atf_letter88.txt