A projectile for delivering an incapacitating agent through a barrier includes a canister containing the agent and having a closure. The canister is retained in a holder to which is fixed a sleeve formed of a plurality of axial fingers configured to spread radially outward upon impact with the barrier. A ballistic body, configured to penetrate the barrier and having a dispersion port, is connected to the holder forward of the canister so as to be axially movable from a forward position to a rearward position upon impact with the barrier, the ballistic body including a closure-breaching member located so as to breach the closure as the ballistic body moves rearward, thereby placing the canister in fluid communication with the dispersion port. The fingers spread radially against the surface of the barrier opposite the dispersion port so as to lodge the projectile in the barrier.