stock, or the ability to otherwise fold or adjust in a manner that operates to reduce the length, size, or any other dimension, or otherwise enhance the concealability, of such rifle. (dd) A functional grenade launcher. (ee) A barrel shroud. (ff) A threaded barrel. (ii) A semiautomatic rifle that has a fixed magazine with the capacity to accept more than 10 rounds, except for an attached tubular device designed to accept, and capable of operating only with, .22 caliber rimfire ammunition. (iii) Any part, combination of parts, component, device, attachment, or accessory that is designed or functions to accelerate the rate of fire of a semiautomatic firearm but not convert the semiautomatic firearm into a machinegun. (iv) A semiautomatic pistol that— (I) has the capacity to use a magazine that is not a fixed magazine, and (II) has any of the following: (aa) A threaded barrel. (bb) A second pistol grip. (cc) A barrel shroud. (dd) The capacity to accept a detachable magazine at some location outside of the pistol grip. (ee) A design which is identical to, or nearly identical to, a design intended for a machinegun. (ff) A manufactured weight of 50 ounces or more when unloaded. (gg) A stabilizing brace or similar component. (hh) A buffer tube or other part that protrudes horizontally behind the pistol grip. (v) A semiautomatic pistol with a fixed magazine that has the capacity to accept more than 10 rounds. (vi) A semiautomatic shotgun that— (I) either— (aa) has a fixed magazine with the capacity to accept more than 5 rounds, or (bb) does not have a fixed magazine, and (II) has any of the following: (aa) A folding, telescoping, or detachable stock. (bb) A pistol grip or bird's head grip. (cc) The ability to accept a detachable magazine. (dd) A forward grip. (ee) A functional grenade launcher. (vii) Any shotgun with a revolving cylinder. (viii) All belt-fed semiautomatic firearms, including TNW M2HB and FN M2495. (ix) Any combination of parts from which a firearm described in clauses (i) through (viii) can be