Model 70 Identification - Palma sights

I just traded for a Winchester Model 70 with Heavy Varmint on the barrel. Serial number G213XXXX. It has a 26" stainless barrel on a blued action.
When I met the guy to trade, I was surprised to find it was tapped & filled with screws at the end of the barrel, about 8" up the barrel from the action and on the side of the action opposite the bolt handle. There is also some sort of recessed rail on the bottom of the stock. The stock seems to be a very high end stock.
Can anyone tell me what I have gotten. I realize the holes seem to align with some sort of Palma-type sight, but is this factory or after market mods?
Thanks
When I met the guy to trade, I was surprised to find it was tapped & filled with screws at the end of the barrel, about 8" up the barrel from the action and on the side of the action opposite the bolt handle. There is also some sort of recessed rail on the bottom of the stock. The stock seems to be a very high end stock.
Can anyone tell me what I have gotten. I realize the holes seem to align with some sort of Palma-type sight, but is this factory or after market mods?
Thanks