I'm not speaking for Ithaca, but I wouldn't consider a MC stock an "extra" in the sense that it was just added garnishment. Stock configuration speaks of the intended use of the gun. Stocks configured with a MC comb are for rising birds, or rising targets. This is more a usefulness, or a need, than an "extra", IMO. However, there is no way for me to know what Ithaca meant, or intended, by the term "All Extras".

May God bless America and those who defend her.