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The Hatfield SAS 12 gauge uses an innovative operating system that blends gas and inertia operations to produce a fast cycling moderate recoil semi-auto shotgun. The gas piston moves only one inch to kick the bolt rearward and start the operating cycle. Fewer moving parts mean increased reliability in the field. The gas/inertia system works dependably with most commercial 2.75" and 3" magnum shells.

It is a gas/inertia system . The gas piston moves only one inch to kick the bolt rearward and start the operating cycle. Fewer moving parts mean increased reliability in the field. The gas/inertia system works dependably with most commercial 2.75" and 3" magnum shells.Specifications and Features: Hatfield SAS USA12T Semi Automatic Shotgun Gas/Inertia Operated 12 Gauge 5 Rounds 20" Barrel Fixed Cylinder Bore Blade Front Sight 3" Chamber High Strength Aluminum Receiver Full Length Rail Adjustable Synthetic Stock Black Finish Overall Length 40" Weight: 7.2 lbs

This shotgun uses both Gas and Inertia operation Randy ----(Specifications and Features): - Hatfield SAS USA12T - Semi Automatic Shotgun - Gas/Inertia Operated - 12 Gauge - 5 Rounds - 20" Barrel - Fixed Cylinder Bore - Blade Front Sight - 3" Chamber - High Strength Aluminum Receiver - Full Length Rail - Adjustable Synthetic Stock - Black Finish - Overall Length 40" - Weight: 7.2 lbs.

Hi Randy, it has both actually Gas and Inertia SPECS-- Hatfield SAS USA12T - Semi Automatic Shotgun - Gas/Inertia Operated - 12 Gauge - 5 Rounds - 20" Barrel - Fixed Cylinder Bore - Blade Front Sight - 3" Chamber - High Strength Aluminum Receiver - Full Length Rail - Adjustable Synthetic Stock - Black Finish - Overall Length 40" - Weight: 7.2 lbs.