Gyroscope a precessional angular motion.....

(1).
When a body moves along a curved path with a uniform linear velocity, a force in the direction of centripetal acceleration has to be applied externally over the body, so that it moves along the required curved path. This external force applied is known as active force.

(2).
When a body, itself, is moving with uniform linear velocity along a circular path, it is subjected to the centrifugal force radially outwards. This centrifugal force is called reactive force.

This two forces are acting on gyroscope. And make it balanced under gravitational forces.