"It was an honest mistake," Talib told the newspaper. "I wasn't doing anything wrong and I'm glad I didn't get punished twice because the incident itself was punishment."
The league's letter reminded Talib of the NFL's Personal Conduct Policy and firearm policy.
There were no allegations that Talib used an illegal firearm. The 31-year-old cornerback, though, must also provide the NFL with a list of all firearms he currently owns along with documentation verifying that Talib has completed an approved firearms safety course, per Rapoport.
The veteran cover man is entering the fourth year of a six-year, $57 million pact he signed in 2014. Talib is coming off a sensational season that saw him finish the campaign as the NFL's second-ranked cornerback, per Pro Football Focus, just behind teammate Chris Harris Jr.