The 6920 has a M4 profile barrel and it's chrome lined. The Expanse has a medium profile barrel and it's not chrome lined. That's why it's heavier also.
That rail is a little dated. I would go with a picatinny style for more mounting flexibility. Something like this or others like it. MI-1022SM <br>Ruger 10-22 Scope Mount
Get the rechargeable battery and tail switch if you like those as options.
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Mounts
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I have a used wood stock with the hardware I'm not going to do anything with. Has some dings and dents from use but it's solid. PM me your shipping info if you want it.
Hip, pelvis, spine is what I was told living in bear country a long time ago. Trying to stop it physically from being able to get to you. Everybody carried magnum revolvers in the woods. I never mentioned caliber in my post.
What ever you shoot it with your supposed to shatter its hips to disable it. They have such a slow heart rate that even with a well placed shot to the vitals they will still have enough in them that it will ruin your day if your anywhere near them.