Hi Hershel,
I do not think this could be an Armory stock. If you look at the first picture the top line of the stock is level all the way to the loading port cutout. The armory stocks began to taper down about half way back the receiver ring. The cheek piece also does not look added. I realize that G&H could add a cheek piece to an armory stock if the customer requested, but this does not look to be one of those additions. In the second set of pictures, the inletting looks way to good to be armory work. The armory stocks generally had plenty of clearance, particularly at the rear tang. Lastly I believe what you see in front of the rear sling swivel stud is a dent from the swivel making contact with the stock. There is a similar but lighter dark spot behind the swivel stud. It is also to close to be the other base hole. But I do agree that it started life as an NRA sporter.

The sling swivels are Hart arms swivels. After closer inspection, I believe it is a Hart Arms stocked rifle.

John