18 USC § 922(r) - (a) No person shall assemble a semiautomatic rifle or any shotgun using more than 10 of the imported parts listed in paragraph (c) of this section if the assembled firearm is prohibited from importation under section 925(d)(3) as not being particularly suitable for or readily adaptable to sporting purposes.
925(d)(3) - The Attorney General shall authorize a firearm or ammunition
to be imported or brought into the United States or any possession
thereof if the firearm or ammunition -
H.R.2112 Sec. 541 None of the funds made available by this Act may be used to pay the salaries or expenses of personnel to deny, or fail to act on, an application for the importation of any model of shotgun if--
(1) all other requirements of law with respect to the proposed importation are met; and
(2) no application for the importation of such model of shotgun, in the same configuration, had been denied by the Attorney General prior to January 1, 2011, on the basis that the shotgun was not particularly suitable for or readily adaptable to sporting purposes.
Just thought I would add some pertinent text, but I don't feel like deciphering the text ATM. Really we won't know until the they make up the law as they want it to be. Someone will have to write the boys for that to happen.