A weapon grip assembly for mating with a weapon without tools is provided. The assembly generally includes a handle, a weapon interface supported by the handle, and an actuator operatively engageable in furtherance of securely affixing the weapon interface to a lower portion of an unaltered handguard of the weapon. The weapon interface generally includes a mount body, and an actuatable locking structure reversibly extendible from the mount body via operative engagement of the actuator.