Arjun, 30, who teamed up with good friend Ranveer Singh in the film, took to Twitter to share his excitement.
The 2014 film, directed by Ali Abbas Zafar, also starred Priyanka Chopra and Irrfan Khan in pivotal roles.
"One of the coolest experiences I ever had... Gunday!!! @RanveerOfficial @priyankachopra @irrfan_k @aliabbaszafar," he posted on Twitter.
Set in 1970s, the film talks about the journey of Bikram (Ranveer) and Bala (Arjun), who are gun carriers and coal bandits. They ultimately grow up to become the most powerful goons of Calcutta.