[Gumpy]

http://www.guns.com/reviews/marlin-model-925/

This may help!

 

[Gumpy]

It's the only difference I could find!

 

[Gumpy]

I'm thinking I may look for a walnut stock for it. I wonder how many other Marlin .22 models it's compatible with.

The "R" signifies Rayon! That's the word I couldn't remember!
I would think a 925 walnut stock could replace the stock of a 925R.