riverwatcher,
First, WELCOME ABOARD. - You have found what I consider to be THE best gun forum on "the Worldwideweird".
(This forum has MANY real experts on numerous subjects related to firearms, ammunition, law enforcement, etc. but I am NOT one of them.)
The Marlin 30TK is a "contract rifle" made expressly for K-MART stores, just as Marlin made rifles that were contracted for sale at Montgomery Wards, SEARS, OTASCO, FEDWAY & probably other large retailers..
I seriously doubt that ANY such .30-30 carbines were every made that way BUT it's entirely possible that someone may have changed out the barrel for a SS one.
yours, sw