This article demonstrates the effect of unfolding the fins of an air delivered projectile on its stability with time. The stability margin of an air delivered projectile was studied in a 6-DoF coupled computational fluid dynamics (CFD) simulation from a wing station of an aircraft in a control volume as the fins were unfolded from their respective enclosures. The fins were fully unfolded as the projectile travelled freely under the influence of aerodynamic and gravity forces. The simulation used an inviscid regime to simplify the problem, and boundary conditions were given to imitate a specific altitude. This study has pointed out the notable changes in a critical performance factor of the store and aims to provide a better fundamental understanding of it, in this special case of tail section with unfolding fins. The static margin of the projectile is a critical aspect of the safe store separation and accuracy of the projectile, and it would greatly influence the safe separation and performance aspects of the projectile. The same study has been carried out without the presence of the wing to better understand the effect of the wing on the stability of the store. The results gave insights on how the stability of the store changes in the presence of the wing during the store separation.