“Inertia Driven®” is the heart of the Franchi family of semi-automatic firearms and relies upon one of the basic laws of physics: The Law of Inertia. In physics The Law of Inertia states that an object at rest tends to stay at rest; that object, in the Inertia Driven® system, is the free-floating bolt. When the gun is fired all of the fixed parts of the gun are propelled rearward by the gun’s recoil. In the Inertia Driven® system, all of the gun parts are fixed except one – the free-floating bolt. Between the free-floating bolt and the rotary locking head is a short, very stiff inertia spring. When the gun fires, the bolt briefly holds its position as the fixed parts move to the rear, causing the inertia spring to be compressed. As the shot charge leaves the barrel and the rearward force of the gun diminishes, the compressed inertia spring throws the bolt rearward with sufficient force to unlock the rotating bolt head, eject the spent shell and recock the hammer. The recoil spring then returns the bolt, which travels forward picking up and chambering another shell and locking the rotating head back into place. With the Inertia Driven® system, the bolt weight and inertia spring power are sufficient to cycle light loads and they have no choice but to function on all heavier loads – it’s the law of physics.
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