John, the light piston is designed for lighter loads such as target loads, low-recoil loads, and most other common loads while the heavy piston is for more powerful loads such as most 3 inch shells, slugs, magnum turkey loads, etc. (Technically the light
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Anonymous
Answered
there are no gas pistons in this shotgun it is a inertia gun
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Anonymous
Answered
John, this 12GA shotgun operates with an inertia style action and not "Gas Piston". Inertia operation involves a bolt carrier and inertia spring that are not rigidly fixed to the rest of the gun. When the gun is fired, the recoil pushes the gun backwards
