So apparently as of the middle of last year the general consensus was that all NFA weapons were exempt from 922r violations. Well I plan on SBRing an MP5K clone - MKE AT94k, which is imported in a pistol configuration so is exempt from 922r. However I am hearing alot (mostly on HKpro.com) that now this is untrue if I SBR it. Anybody have any insight to this? I know the reason was because of a letter received from the ATF in response to this question, however the law is vaguely written (as they all seem to be) and until this letter started floating around nobody cared. Thoughts?