In 2014, Barnett once again followed head coach Billy Back, this time to the Nashville Venom of the Professional Indoor Football League (PIFL).[4] Barnett was named the Offensive Player of the Year in the PIFL, helping the Venom to a 10-2 record, and a PIFL Championship.[5]
On October 20, 2016, Barnett signed with the Wichita Falls Nighthawks. On April 27, 2017, Barnett was placed on the transfer list.
Cleveland Gladiators
On January 9, 2017, Barnett was assigned to the Cleveland Gladiators. On February 10, 2017, Barnett was placed on league suspension. On May 2, 2017, he was activated from league suspension. On June 12, 2017, Barnett was placed on reassignment. On June 14, 2017, Barnett was once again assigned to the Gladiators.
Washington Valor
On March 19, 2019, Barnett was assigned to the Washington Valor.
On January 14, 2022, Barnett signed with the San Antonio Gunslingers of the National Arena League (NAL).[8] On March 31, 2022, Barnett was released by the Gunslingers after being suspended indefinitely by the league.
On June 2, 2022, Barnett signed with the San Antonio Gunslingers of the National Arena League (NAL) after having his suspension lifted by the league.[11] On October 23, 2022, Barnett re-signed with the Gunslingers.[12] Barnett became a free agent at the end of the season.