I refinished my factory beech/birch stock with the same desire as you, to go darker. But, I sanded the snot out of mine before I even thought of staining. Not sure how the steaming works, I would venture to guess that it may pull out some color since the wood isn't sealed.
It's possible you may have to go back to square one... Besides that, dings, scratches, and dents show character. They let you know where that gun's been and what you've been through with it. I had a few blemishes show up after the fact while putting it back together and not paying close attention to my screwdriver's end and the silly dog's toenails....
Good luck!
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