The Sportsman 15 bolt is different from the Sportsman 5. The 15 has a groove cut across the underside of the bolt to activate the cartridge lifter. A 5 could be modified but would not feed without the modification (which has to be in the right place!). Either bolt is hard to find these days as they haven't been made for over 50 years (and foolish people keep storing their rifles with the bolts removed!).
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