Cool on the bolt, it hasnt been re-numbered by the look of it? I had wondered if this gun wasn't put together from 2 buggered ones sometime later since the stock is probably the earlier number as well except the etching looks so genuine and has F53 on major parts. One of my guns is 308xxx and has far fewer stamps, just S^S out of service all over it, yet this one seems to have lots of other stampings and been well used, I find the difference in the lives of the 2 fascinating.