Bob, this will take both 3" and 2 3/4" shells, it has a 3" chamber.

Pardus makes 10 different types of shotguns and several models of each
pardusarms.com/urun/sb-external
I didn't go through every single sku but looking quickly through the several it looks like most if not all if the 12GA do have 3" chambers, a shotgun with a 3" chamber will run 3" and 2¾" shells.
Shorty shells (1¾" and 2½") may have trouble cycling correctly through semi auto, the break open, bolt action and pump shotguns should run everything.

Every type of shell since it has a 3-inch chamber and will shoot any 3 inches or shorter shells with no issue. I hope this helps.

Bob, it has a 3 inch chamber and will shoot 3 inch or shorter shells no issue. Cheers and stay safe!