Benelli M1 Super 90 question

I am looking at getting a M1S90 and I am trying to ascertain some info. The way I understand it is the gun does not have Crio barrels that only the M2 SBE2 have those. The gun does have a shim kit that allows drop/addtion of comb but not cast on or off. The gun can be fitted with a Benelli aftermarket large saftey, as teh one that comes with it is the standard small button safety that is on the trigger guard.

Is this right? Some one put me in my place if I am wrong. I would ask the sell these questions but I have had a heck of a time getting him to answer me.

Thanks.