(D)  a second handgrip or a protruding grip that
can be held by the non-trigger hand;
                   (E)  a flash suppressor; or
                   (F)  a grenade launcher or flare launcher;
             (2)  a semiautomatic centerfire rifle that has a fixed
magazine that holds more than 10 rounds of ammunition;
             (3)  a semiautomatic centerfire rifle that has an
overall length of less than 30 inches;
             (4)  a semiautomatic shotgun that has the capacity to
accept a detachable magazine;
             (5)  a semiautomatic shotgun that has a folding or
telescoping stock and has:
                   (A)  a thumbhole stock; or
                   (B)  a second handgrip or a protruding grip that
can be held by the non-trigger hand;
             (6)  a semiautomatic pistol that has the capacity to
accept a detachable magazine and has:
                   (A)  a second handgrip or a protruding grip that
can be held by the non-trigger hand;
                   (B)  an ammunition magazine that attaches to the
pistol outside of the pistol grip;
                   (C)  a threaded barrel capable of accepting a
flash suppressor, forward handgrip, or silencer; or
                   (D)  a shroud that is attached to or partially or
completely encircles the barrel and that permits the shooter to
hold the firearm with the non-trigger hand without being burned;
             (7)  a semiautomatic pistol that has a fixed magazine
that holds more than 10 rounds of ammunition;
             (8)  a revolving cylinder shotgun; or
             (9)  a conversion kit, part, or combination of parts
from which an assault weapon can be assembled or with which a
firearm may be converted into a weapon described by Subdivision
(1), (2), (3), (4), (5), (6), (7), or (8).
       (b)  A person who is younger than 21 years of age commits an
offense if the person knowingly:
             (1)  purchases an assault weapon; or
             (2)  possesses an assault weapon.
       (c)  An offense under this section is a Class A misdemeanor.
       (d)  It is a defense to prosecution under Subsection (b)(1)
that the actor purchased the assault weapon for the actual
discharge of official duties as:
             (1)  a peace officer; or
             (2)  a member of the armed forces or state military
forces as defined by Section 431.001, Government Code.
       (e)  It is a defense to prosecution under Subsection (b)(2)
that:
             (1)  the actor possessed the assault weapon in the
actual discharge of official duties, or directly en route to or from
the person's place of assignment, as:
                   (A)  a peace officer; or
                   (B)  a member of the armed forces or state