It sounds like a much modified rifle, with the barrel has been rebored and the stock isn't original.
Yes, all 725 were factory d&t with 4 holes on the top of the receiver, the same hole pattern as the Remington 721, 722, and 700.
The 725 was very similar to the 700 that replaced it, but most of the 721s and 722s had plain, non-checkered, wood and all of the 721s and 722s had the sheet-metal bottom metal. Rather than upgrade an existing model, Remington opted to consolidate the 721, 722, and 725 into the "new"(renamed) 700 ADL and 700 BDL.
Jeff
