A gun lock assembly formed of two major components, a chamber blocking rod member and a locking rod member. The chamber blocking rod member has a shank portion that is longer than the gun barrel to be blocked and a 90 degree extension terminating in a closed loop. The locking rod member has an open end and and a locking aperture end. The opening in the open loop is of sufficient width to accept the smaller of the cross sectional dimensions of the the trigger guard and the locking aperture end is sized to be introduced into the closed loop of the blocking rod member. The open loop of the locking rod is assembled to the trigger guard and the locking end is introduced into the closed loop and locked. The blocking rod member can not be removed without unlocking and removing the lock.