(a) An individual may purchase a firearm from a governmental entity if:
(1) the individual was a peace officer commissioned by the entity;
(2) the individual was honorably retired from the individual's commission by the entity;
(3) the firearm had been previously issued to the individual by the entity; and
(4) the firearm is not a prohibited weapon under Section 46.05, Penal Code.
(b) An individual may purchase only one firearm from a governmental entity under this section.