The only other situation which i can visualize is that it could be a standard Model 70 barrel and action with a replacement XTR inventory. This is often unlikely however...I believe that it is as you explain, an unmarked XTR. This gun is chambered in .308 Winchester and it has https://model-70-featherweight24264.blogginaway.com/27336528/getting-my-model-70-featherweight-to-work