This is that problematic 62 caliber rifle with a faulty lock and a weird front end of the barrel, etc etc. But I was sanding the breech plug last night, and out came distinct engravings. This is what they look like: crossed swords, making four triangles, top, bottom, left, and right. In the top triangle there is a solitary T. The bottom triangle has a solitary B. Left triangle, 299. Right triangle, 2007. My best guess is that this means Thompson center made the rifle in 2007, is number 299 of that production cycle, and the B stands for whatever model of rifle corresponds with the letter B. Am I close, or way off the mark? When I figure out how to post pics to this forum, I'll draw a picture of that figure, photograph it, and post the photograph.