Cooey model 60 and mod 660 stock compatible?

They will fit but you need a few internal parts to make the change over.I've done a few and it's pretty easy.

What parts/work specifically would need to be done?

Glad I searched this question first, I was about to post asking the same thing! I've got an old Model 60 but I like the stock on the 600 more...
 
magazine tube and stock are of different length. You could possibly fit a stock, but couldn't load the rifle through the gate.

Memory is not my friend.... Takedown stud/screw assembly is different, and the newer 600 is longer in both stock, and magazine tubes. I no longer have any of th'new fangled Cooeys here to actually compare.
 
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