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According to the UPC it's inertia. The SA Shotgun Tact is an efficient and reliable no-nonsense 12GA shotgun operating with an inertia style action and features a lightweight aluminum receiver with a 4 + 1 capacity. Comes with light weight polymer furniture and 18.5" vent rib barrel reamed for full. You can always contact rock island armory at (775) 537-1444 or email at support@armscor.com and double check but looking like inertia. Hope this helps.

John, (Inertia) - The SA Shotgun Tact is an efficient and reliable no-nonsense 12GA shotgun operating with an inertia style action and features a lightweight aluminum receiver with a 4 + 1 capacity.

John, gas operated, straight from RIA website --- The Lion Tactical SA (X4) is an efficient and reliable no-nonsense 12GA shotgun operating with a gas operated action and features a lightweight aluminum receiver with a 4 + 1 capacity. >>> armscor.com/firearms/ria-imports/shotgun-series/semi-auto-series/sa-shotgun-tact/ .....Also, it comes with the light load piston installed, and includes a heavy load piston in the box. ..... BUT the spec sheet says inertia >>> https://cdn2.hubspot.net/hubfs/559399/Armscor_March2020%20Theme/Pdf%20Files/X4_-_SA_Shotgun_Tact.pdf .....spec sheet is mistaken.

Its Gas operated.