Abstract: A barrel of a firearm is held by a firearm restraint housing having a pair of spaced apart rotors rotatably mounted and contoured for receiving the barrel of the firearm therebetween. A slide member is positionable in interference with rotation of the rotors in its first position and in non-interference with rotation of the rotors in its second position. The position of the slide is determined electromechanically or by a hand key operated lock. The rotors are contoured so that withdrawal of the firearm barrel counter-rotates them into a barrel receiving attitude, and further, placement of the barrel between the rotors forces them into counter-rotation for locking around the barrel.