AA 24” Overwatch Barrel?

[Mesa1978]

I bought an AA Overwatch upper from Midway many years ago, mine has a Shaw barrel, 1/9, no markings on it are visible above the tube fore end, was assembled prior to Shilen being an option from AA on the Overwatch. The Shaw is a MOA barrel and heavy, it was a way to get into 6.5 Grendel, but I wouldn't buy another. I have a 20" Shilen 6.5 Grendel barrel that has engraving on it, identifying it as a Shilen. I don't know if the AA Overwatches with a Shilen barrel were engraved similarly.