Shotgun chokes

I picked up a used barrel for my 500a.
It came with a ported turkey choke. Anyone know if the porting specifically reduces kick back? The mule kick I'm used to just doesn't seem there. I plan on getting an IC choke but I'm having trouble finding one.

The ports will cut back on the kick, sometimes a lot.

there main purpose is exactally that,
resighting by reducing kick with out comprimising accuracy and volicity much.