Section 9. Firearms.
(a) Whenever a player is physically present at a facility or venue owned, operated, or being used by a Team, the NBA, or any League-related en y, and whenever a player is traveling on any NBA-related business, whether on behalf of the player’s Team, the NBA, or any League-related en y, such player shall not possess a firearm of any kind. For purposes of the foregoing, “a facility or venue” includes, but is not limited to: an arena; a practice facility; a Team or League office or facility; an All-Star or NBA Playoff venue; and the site of a promotional or charitable appearance.
(b) Any violation of Section 9(a) above shall be considered conduct prejudicial to the NBA under Article 35(d) of the NBA Cons ution and By-Laws, and shall therefore subject the player to discipline by the NBA in accordance with such Article.
http://www.nbpa.com/cba_articles/art...I.php#section4