Thanks HH2. The 152k I have is an early one, with the all wood stock, no plastics on it. I know they were build late '40's into the '50's, and with the way they kind of mimic the M1C I was thinking there was a good possibility they actually used surplus slings. I'll look to see if I can find one of the Mossberg nylon slings.
Right now I'm working on the stock, stripping it down to refinish it. I might do a reblue job on the metal too, but we'll see. At the least I know I need to reblue the magazine.