The latest evolution in CZ's semi-automatic shotgun line, the 1012 uses a gas-less inertia operating system. Instead of redirecting gas from the barrel to run the action, the 1012 uses a spring within the bolt to store energy during the shotguns recoil, spending this energy a split second later to rotate and unlock the twin lugs from the barrel extension and withdraw the spent shell. Additionally, the gas-less system itself is tuned to run a wider variety of shells from light-recoiling target loads up to the 3" magnums currently on the market.