High Explosive (HE) round: an artillery or mortar projectile containing explosive filler designed to inflict damage through blast and fragmentation effects.

A device attached to a firearm's muzzle to redirect propellant gases, reducing recoil and muzzle rise during firing.

A breech mechanism in artillery where a solid block slides horizontally to open and close the breech for loading.

A recoil system component that absorbs and returns energy from firing, reducing stress on the carriage by using compressed springs to cushion recoil.