Miss. Code Ann. § 45-9-85

An alleged offense under Section 97-37-1 , as it existed on June 30, 2023, of concealed carrying of a muffler or silencer for any firearm, or under Section 97-37-31 , as it existed on June 30, 2023, of possession of a device that is used to muffle a firearm, may not be prosecuted on or after July 1, 2023. If on July 1, 2023, a criminal action is pending for an offense described in this section, the action is dismissed on that date. However, a final conviction for an offense described in this section which exists on July 1, 2023, is unaffected by Sections 45-9-81 through 45-9-85 .