http://www4.law.cornell.edu/uscode/18/921.html
Title 18, Part I, Chapter 44, Sec 921 - Definitions
30(D)
a semiautomatic shotgun that has at least 2 of -
(i) a folding or telescoping stock;
(ii) a pistol grip that protrudes conspicuously beneath the action of the weapon;
(iii) a fixed magazine capacity in excess of 5 rounds; and
(iv) an ability to accept a detachable magazine.
Title 18, Part I, Chapter 44, Sec 921 - Definitions
30(D)
a semiautomatic shotgun that has at least 2 of -
(i) a folding or telescoping stock;
(ii) a pistol grip that protrudes conspicuously beneath the action of the weapon;
(iii) a fixed magazine capacity in excess of 5 rounds; and
(iv) an ability to accept a detachable magazine.
