a counter projectile being used to balance recoil

Full Title

Missile propulsion characterised by the use of explosive or combustible propellant charges (projecting missiles without use of explosive or combustible propellant charge F41B; launching rockets or torpedoes F41F3/00; missile self-propulsion F42B15/00) > Recoilless guns, i.e. guns having propulsion means producing no recoil > a counter projectile being used to balance recoil