its a Sears 22811 which makes it more kin to a BT3000 than a BT3100. It was introduced when the BT3000 was the current Ryobi model.
The shims, etc and mechanics, rip fence anodized top, and rails are all BT3000 except it has a splayed leg base which makes it look more like a BT3100.
detailed differences listing in the BT3 FAQ.
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