Where can I find a description of the Beeman air guns?

I have a Beeman R10 with the deluxe stock. I'm trying to find a value but I'm finding a lot of different models with prices all over the place. Is there a breakdown somewhere that explains the differences between the different models?

Blue Book will show pricing (subjective) and models...
 
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Blue Book will show pricing (subjective) and models...
I hadn't looked at it for a couple of years. It is the beech stock and not the deluxe. It is a 20 cal. Metal is perfect and the stock has what appears to be very small paint marks like it was bumped. I believe there is only one that I can actually see a slight dent in the finish. Some of the marks appear light enough that they may be able to be polished out.

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