7.62mm Mauser

[Calif-Steve]

It is a 2 groove barrel that is identical to a Remington 2 groove. The exterior of the barrel has been contoured to a Mauser shape. So no markings I can see. Also, the barrel does not mount flush with the receiver. This is a common problem when using '03 barrels on Mausers. So, this is a "looks like a duck" matter.