The criminal case arose last winter, as Felton grappled with the breakup of his marriage and navigated a struggling season with the New York Knicks. He was traded to Dallas last month, two days after his plea plan was announced.
The team declined to comment Wednesday.
About a week after Felton's law student wife filed for divorce, her attorney brought a loaded semi-automatic handgun to a police precinct and said it was Felton's and she wanted it out of the house, authorities said. Walden has said Felton never threatened anyone with the gun.
After police contacted Felton, he turned himself in shortly after a Mavericks-Knicks game at Madison Square Garden.
Felton was charged under a state law that bans many large-capacity ammunition magazines. Prosecutors said Felton's could hold about 20 rounds.
The NBA, which has said it is monitoring the case, had no immediate comment Wednesday. The league usually waits until criminal cases against players are resolved before deciding whether to impose any fine or suspension.
Felton, 30, was a star at the University of North Carolina and was the fifth pick of the 2005 NBA draft. Besides Dallas and New York, he's played for the Charlotte Bobcats, Denver Nuggets and Portland Trail Blazers.
Last season, Felton missed 17 games while battling injuries and averaged a career-low 9.7 points as the Knicks went 37-45 and missed the playoffs.