The sole other scenario that I can imagine is the fact that it may be a standard Model 70 barrel and motion that has a replacement XTR inventory. This is not likely even though...I believe that it is as you describe, an unmarked XTR. The forward situation is "hearth" and https://fernandoouzfj.thenerdsblog.com/32297910/the-2-minute-rule-for-winchester-classic-compact