Hello everyone

I picked up this rifle for a good deal and I am guilty of putting the scope on it years ago. Recently I've been getting to know the gun a little more by the markings that are on it. Not shown in the photos is the serial number under the back sight also matching. My understanding is that the 18 on the left receiver photo means that the rifle was re-barrelled. Is my understanding correct? What do some of the other markings mean? Why is there no mention of the manufacturer under the crown and GR on the Shtle III* picture? I would like to know a little more about this firearm. What can you tell me? The butt of the stock also has a 1.25 addition to it where the wood is different. Would that be for a taller guy using this firearm?
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