You need a Viton o-ring. 12 ga is #21 Viton o-ring; if its a 20 ga, its a #19 Viton o-ring. You can get them on line cheap or at a tool/equipment supply place for cheap. I know Grainger Supply carries them. Hope this helps
You need the magazine tube with follower attached. I just bought a new Marlin 60 and in the manual that is one part called "magazine tube, inside complete" with Marlin part number 507922.
Not sure when your gun was made and whether it's changed but that's the current part.
Brownells...
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