They went out of production before serial numbers were REQUIRED, but you may find some on the lug or inside the receiver (manufacturers need some way to make sure the fitted barrels and receivers stay together during the manufacturing process). Disassembly is simple: make sure it's unloaded. Repeat step one. Close the action, then pull down on the front of the forearm (it should just be held there by spring pressure). Once the forearm is down, you can take it off, then open the action again, and the barrel will separate from the receiver. Reassembly is in the reverse order.