.300 WSM trouble

[polo]

Little brother has a model 70 Super Shadow and was shooting it and it stopped ejecting. The bolt doesn't have the classic claw extractor, it's a small piece in one of the lugs that looks like its held in by a spring pin. The angled edge of the thing is completely sheared off. Anyone else with this problem? Where can I get part and can I do it myself or have to take to a gunsmith or send it back to Winchester? He's shooting Winchester factory ammo, no reloads! Any help apreciated.