Yes, the receivers are.are these recovered drill rifles too?
Yes, the receivers are.
I know there's a big controversy about using the drill rifles for builds, but in all honesty I believe it's a bunch of hoopla.
The owner of Gibbs (son of the owner of Navy Arms) is a respected gunsmith in the community with a long history of building quality firearms. He responded to the concerns expressed by some on the net about this issue.
http://www.militaryarmschannel.com/transfer/val_message.pdf
In short, the 1903's had the barrels tacked on with a small spot weld and then magazine cut-off levered tacked as well. These welds were removed in the creation of these rifles. The receivers have been tested and meet or exceed military specs for Rockwell hardness and no issues have ever been reported to Gibbs. His rifles are in demand because they win the retro sniper rifle matches.
From what I can see in my example, the attention to detail and the quality of the build is nothing short of superb.