Hi Tom, it will fire the mini shells, but will not reliably cycle them.
Stay safe & have a great day!

You're not going to have much luck with the mini 1 3/4" shells. They will not cycle reliably.

Hi Tom and welcome. It will not cycle 1 3/4 shells reliable. Nobel makes some 2-inch shells that would cycle. gun-tests.com/ammo/12-gauge-mini-shells-from-federal-aguila-and-nobel/ --- Cheers and stay safe!

it will work fine with 2 3/4 inch ammo with the 1.75 inch mini shells it will not feed them you can shoot the but it makes your gun a single shot, IE Put shell in barrel close action pull trigger eject shell and repeat