Newbie here. Possible 03? A customer thought he had a Winchester30-06

[RCS]

Promo you could be correct, but a difficult restoration if the W&S holes were enlarged to remove the threads - also the "Hatcher hole" on a W&S scoped rifle is not the best kind of a restoration. It is kind of like the anneal receiver color on a prewar M1 rifle restoration. Holes can be fixed.
I had a friend that found two barreled actions at the CMP, both receivers had the W&S screw holes and plugs, he was able to restore these rifles (but is still looking for a better late 1917 barrel). I did mill the left inside of two stocks for him (used a 10mm ball end mill if I remember) so that the actions would fit with the W&S brackets. These receivers did not have the Hatcher holes.

[esptud74]

Aren't these "Hatcher" holes necessary?

Is this a safe receiver to shoot?

[Promo]

Sorry for the confusion. RCS is a member here and that is his username/nickname. SRS refers to the "Springfield Research Service", basically a list of serial numbers of various rifles where the history is known.

The front hole is the so-called "Hatchers-Hole", a gas escape hole which was added during overhaul on those rifles which didn't have them ex-factory. The three "rear holes" with identical space in between are for mounting the scope bracket for the Warner & Swasey Musket Sight to the rifle. In the serial range this rifle is in, it would be for a M1913 variant of these scopes (there was also a M1908 variant).

Do those three rear holes still have a threading, or are they smooth?

The scope mount is definately civilean (it was made by Redfield, see the markings on the scope base - similar to the M1903A4 scope base, but not the original type), the barrel COULD be the original (with a removed rear sight base) while the heavily modified bolt appears to not be original to the rifle, at least not all of it.

[Neal Myers]

Not enough definition in your photos, but that looks like it could be a $500 1903A4 bolt. And, the Redfield Jr sight base could bring a fair price.

Neal