Barely, I believe the USMC Armorers tweaked them a bit. Bedded the action, and sanded then oiled the stock. The Unterel Scope wasn't exactly off the shelf, but it wasn't the best available at the time either.
If I remember the book correctly, the USMC Sniper program was getting started back up when Gunny Hathcock first joined and the TO&E was pretty much put together on the fly.
I also believe he was doing some of his own work when it came to his bolt.
The USMC wasn't known for having a great budget at the time and Snipers were an unknown commodity, not a lot of interest or money was available at the time to the program.
It's been a long time since I read his book, but I believe they were closer to something you might expect to see in the field on a Whitetail hunt than what we see our USMC Snipers have today.